A/N: Well here we go! This is my third year of running these '100 days to...' stories, the first year for Supergirl, last year for the four series of the Arrowverse. Last year I did it as smaller, separate blocks, but this year, because ambition got to me, I decided to make it a single, 100-day/chapter story. And I decided to craft myself a big ol' alternate universe, enabling me to start planning toward it well in time. So I've been preparing for this since last fall and now it's time to start! Of course, you may have seen the series of single chapter stories I've been putting out over the past few months, the 24 'Preludes,' giving you a peek into this other world (I highly recommend going back to check them out, for further information and lead up to this story.)

The only other maintenance issue left for me to pass on has to do with the posting format. As it's not possible for me to create a story marked as crossing over between all four of the shows, I've split it into two volumes, one under the heading of The Flash and Supergirl, the other under the heading of Arrow and Legends of Tomorrow. The odd-numbered chapters will be in the former, the even-numbered in the latter. The easiest way to follow the story would be to put in for notification on both. Now on to the story!

ONCE MORE UNTO THE BREACH
Day 2 of 100

Volume 2, Chapter 1

Location:
BREACH EARTH, HAVEN QUARTER
(ARGUS designation)

There was little to be done. Best as they knew, their message would be passed on through a number of channels before reaching its destination, and while they didn't know what those channels were or how long it would take before they knew it had made it across… they had no choice. For twenty years, Robert and Moira Queen had believed their children had died in the events which at once created this cracked twin to Earth and propelled them on to it. With no way of knowing any better, all they could do was to live on, carrying their grief even as they became the Queens of Breach Earth, of Haven Quarter, who had no children as far as anyone knew. They had long mastered the habit of hiding their true natures, passing themselves for humans when they were not, so why should it be any problem passing themselves for being childless, right?

And all this time they had to live this lie, knowing they had played a hand in it… and that another player was within their midst. Malcolm Merlyn… How long had they tried to keep him out of their lives after coming here, and then he'd gone and told them what he'd told them…

Their children were alive. Oliver. Thea. They lived, back on the other Earth. When Malcolm had approached her and revealed this to her, she'd been certain this was little more than a trick, and how could she think anything else? Part of her would wish that they'd never crossed paths with him, that she'd never… had that moment of weakness with him. But then if not for that weakness, she would never have had the joy that was her little girl, her Thea… for how little she'd gotten to see of her in the end. Three years she'd had with her before the events leading to their being ripped apart, but she wouldn't trade them in for anything.

As little as she wanted to believe Malcolm, knowing what it would do to her, to Robert, when it was inevitably shown to be a lie, all of it had been thrown upside down when she'd been shown those pictures and in looking at them, she'd known… it was all true. And more than being shown that her children were alive, she'd been shown that not only had they come into their gift, their speed… They'd been using it in the guise of costumed heroes.

The revelation might have been seen as a gift, and little could be denied of the joy it had brought both her and her husband, but they knew better than to ignore the thorn on the rose. He claimed only to have learned this truth recently, but this much she would not believe, which then had left them with the inevitable question: Why now?

After Robert had been told of the encounter, they had needed to know, without a doubt, that the pictures and the proof they claimed to carry were indeed genuine. They had gone to one of their young allies. Iris West was one of the few in their circle, of those who knew the truth about them, who was human, and they had come to know of her, of all things, via their ties to Malcolm Merlyn. In knowing him, and his son, they had met Joseph West, and his children. Of Merlyn, of West, the less said the better, but their children…Tommy, Iris, Wallace… In their own ways, each one had been friends to the Queens, allies.

Iris had confirmed the pictures had not been doctored, but then in doing so, in realizing the potential implications of Malcolm dropping this truth on them at this time, she had been left to reach the same conclusions and add to them. Malcolm was up to something… and maybe her father was, too. Whether or not it might have ended up playing right in their hands, the first thing they'd sought to do was to reach out to their children, off on Main Earth. No matter what came next, they would face it and maybe, just maybe, they would get to hold their son and daughter in their arms again, and stand at their side to stop Merlyn and West…

X

MAIN EARTH, THE CITY BENEATH THE BREACH

The message was to be put in the hands of someone they might trust to get it to where it needed to go, on the other Earth. Two of those links had been established through Iris West. It might have seemed a strange place to start, but she had counseled them to start off entrusting their message to a former associate of her father's called John Diggle, though she also knew of him through another name he'd been given: Deathstroke. Iris had promised the Queens that, on this, they could trust the man wholeheartedly, especially for his connection to the one she believed would be able to get the message to its destination. She had told the couple of a woman from Main Earth who, having found herself stranded on their Earth, had crossed paths with Diggle, who had been trained by him. Sara Lance. Back on Main Earth now she had a new name of her own… the Green Arrow.

The message was an envelope, which contained a letter to her, explaining what was required of her, two sealed envelopes – letters, addressed to Oliver and Thea Queen respectively – and a necklace, as might be seen as proof both to messenger and messaged that the person who received it was who they said they were, and that the person who brought it was telling the truth when they said…

"Mr. Queen, my name is Sara Lance. I have a message from your mother and father."

The envelope had been sealed by Moira Queen herself, handed down to Iris West, who had sought out John Diggle and handed it to him. He in turn had put it into the care of his ex-wife, Lyla Michaels, a CSI with the police who also had connections to ARGUS and who would be able to get that envelope into the hands of Sara Lance. This had been achieved when Lyla had contacted the team aboard the ARGUS Breach Ship Waverider and passed the message to its leader, Leonard Snart. One trip through the breach later, he had flown down and completed the delivery.

Once Sara had opened the envelope, finding the sealed letters, the necklace, and the letter addressed to her, all she'd needed to do was to track down the speedster siblings. Like just about anyone in the city, she'd heard of this Flash and Kid Flash, as the media had taken to calling them, though she'd never met them personally, didn't know their identities until the letter she'd received effectively confirmed it. As she'd come to find, not only having the necklace but placing it well in view when she'd gone to intercept the brother and sister had been something of an asset. When she'd tracked them down, she had addressed them by their names, figuring there was no point beating around the fact that she knew who they were. And after that, well… they were speedsters, and as best she could guess, they had started to run away, only to stop again when the one they called the Flash spotted the necklace, recognized it, and took it from her.

"Where did you get this?" he'd asked. "This was my mother's, where did you get it?" The girl stood a few feet away, keeping her eyes on her but also looking as though she only wanted to look at the necklace in her brother's hand, once he'd said who it belonged to. If this was all going to work, then they needed to trust her, to listen to her. So, with a breath, she'd pushed down her hood, removed her mask, that she might look to them with her own face.

"Mr. Queen, my name is Sara Lance. I have a message from your mother and father," she'd said, as straightforward as one could get.

There was hesitation, she could see. If they asked how she knew their names, it would be admitting that those were their names, but if they didn't, then they wouldn't get the answers they were seeking, even though confirming the necklace for having belonged to their mother had already more or less done the job. Maybe realizing this, the Flash had reached up to undo his own mask.

"What are you doing?" his sister asked, still looking unwilling to reveal herself.

"Our parents are dead. Whatever this is, I wouldn't have thought the Green Arrow would stoop to this…"

"Your parents are alive, Mr. Queen. They went through a lot of trouble to make sure you knew. It's my understanding that they thought you were killed, twenty years ago. Here…" she pulled the envelope from her pocket. "Along with the necklace were a letter to you, and to your sister. There's also the letter I received, so you'll know what I know. I didn't open your letters."

She watched as he pulled the contents of the envelope. When he saw the handwriting on the smaller envelopes marked 'Oliver' and 'Thea,' she could see his breath catch. Soon, his sister finally approached, one last hesitation before pulling off her own mask.

"Are you familiar with the breach?" Sara asked the pair of them. By the way they looked at her now, she took it as a yes. "As far as I can tell, when whatever happened that you all thought the others were dead happened, they were thrown out there, across the breach, to the other Earth. The same thing happened to me, a few years ago, I lived out there for a while, that's why they reached out to me to get this message to you. Although, from what I hear, they might have skipped right over me if Leonard and his people knew what was in that envelope. They're the ones who brought it across from Breach Earth."

"Leonard Snart?" Oliver asked, surprised. "On the Waverider?"

"Yes," she confirmed. "I should go. If you need to reach me, there's my number in there," she nodded to the envelope even as she got her mask and hood back on. With a nod to the pair of them and a 'good luck,' she was gone.

X

MAIN EARTH, THE CITY BENEATH THE BREACH
HOME OF OLIVER & THEA QUEEN

There had been no point pretending as though their heads were still where they'd been before they'd been approached by the Green Arrow… Sara… The costumes had been put away, they were home now, just Oliver and Thea, each of them holding a letter addressed to them from their mother… who they'd believed to be dead for the better part of their lives. The third letter, the one addressed to Sara, sat on the table between them, along with the necklace. Neither of them knew what to say or where to start.

Twenty years… Oliver looked to his sister, who'd just been so small at the time, only three years old, when they'd lost their parents and been put into the care of the man who would be their guardian, their father. They would have to tell Anatoly in time, too. He had been with them, through all these years, had seen them through any number of adjustments. While he had known that his family wasn't human, known about the gift of speed they had, he'd only known for all of a year before their parents had 'died' and taken all future source of information with them. He'd had to go on from what he'd been told and put the pieces together as far as the rest went… all on his own. And by the time his sister had come into her speed, he had been able to guide her, teach her. It was at that same time that he'd learned their guardian had always known about the things Oliver had been working so hard to hide from him all along. And he'd told him something which had shaped the many years to come, for both siblings.

Whatever had happened to their parents, whatever had supposedly killed them… they'd known it might happen. It wasn't an accident. For years since then he had been trying to find out more, on his own and with his sister. There'd been nothing. And now… now here were these letters. There was no telling what was inside those, what would or wouldn't be said. The fact that they came from their mother already was enough of a miracle, right up there with the fact that their parents were even alive at all…

"I can't seem to pick it up…" Thea broke the silence, and he looked at her, sitting there, arms folded in together, staring at the envelope, her name written there.

"You don't have to do it now," he insisted. After a few seconds, he asked if she wanted them to call Anatoly and ask him to come over. She didn't say it, but he could see it on her face, so he'd called him. The once detective and now police captain had been looking after them all these years, their closest ally and the only one to know their secret. Thea had only ever known him for a parent, had called him 'Papa Toly' for as long as Oliver could remember. Now faced with the return of the parents she didn't remember, it was no wonder she'd want him around.

When he had arrived, with no idea why he'd been summoned, he'd found a pair of gloomy looking faces, and the contents of the envelope given to them by the Green Arrow. The letter she'd left within the envelope did not contain her name, so they'd showed it, too. Much as they trusted Anatoly, he was still with the police, and the Green Arrow was by all accounts a vigilante. They'd taken away the paper with her contact information, too.

Looking to the one unsealed letter, the two sealed ones, and the necklace, Anatoly had been told of the encounter, and the news: Robert and Moira Queen were alive, safe and sound over on Breach Earth. There had been relief in the man's face, hearing his old friends were alive. Of course now he understood the nature of the summons, and he looked to Thea, who still had not touched the envelope with her name written on it.

"I have told you both, many times, about your mother and father, about the people they were. They placed the two of you in my care, they protected you. Those are the people I knew, and whatever these past twenty years have brought, for them and for you…" he slid the envelope closer to her. "You remain the most important things to them." Thea looked up at him, at her brother. Oliver picked up the necklace from the table, moving without a word to stand behind her, fastening the chain around her neck. She looked down to the pendant, touched it for a moment, and then picked up the envelope and opened it.

X

THREE HOURS LATER

Standing in costume once again, the Flash and Kid Flash stood in wait, just where they'd been instructed to wait, until the small ship appeared overhead and descended to land not far from where they stood. They waited until they could see who would step down to meet them. They were soon approached by two women they recognized. Of the ten who followed Leonard Snart along aboard the Waverider, three were agents acting as direct liaison with ARGUS, and Ava Sharpe and Lucy Lane were two thirds of that trio. That they'd only sent the jump ship could either mean that the main ship was off on some other task, or that they hadn't seen it to be necessary to send the entire crew to act as ferry for two people.

For all the two speedsters had done for them, they had never revealed their identities to them, hence the costumes. Even now, the two women were not aware of the reason for their needing a ride over to the Haven Quarter of Breach Earth, only that they had contacted Leonard Snart, and he had arranged for the jump ship to come and collect them and carry them through the breach.

The ride bordered on awkwardly quiet. The two agents might have sensed there was something about this trip which made the two speedsters nervous. Either way, they focused on getting them where they needed to go. The one thing that seemed to get their passengers out of their heads was when the moment came where the jump ship approached the breach opening before them, flew through it, and emerged on the other side into… a world on first glance so similar to the one they'd just left that they might not have believed they'd gone anywhere if they hadn't seen the moment where they'd made the crossing.

"Do you know how long this will take?" Agent Sharpe asked from the seat next to Agent Lane, who piloted the ship. "We may have to leave you and return for you later."

"Sounds good," was all Oliver knew to say. There was no telling how this meeting would go, but it was probably best that they got more time than less.

Soon the jump ship touched down, and the siblings stepped down on to Breach Earth. The two agents wished them the best of luck before flying off once again.

"How are we supposed to find them?" Thea asked her brother after they'd changed out of their suits. There was no address anywhere in the letters, or the envelope. Oliver looked around. This city looked so much like their own, so… maybe… He looked back to his sister. She had no memories of their old house, before they'd gone to live with Anatoly. He'd shown it to her once, in passing, but that was all. Maybe this other world wasn't that similar, but then again… maybe the key to finding their parents was to just go home.

TO BE CONTINUED (tomorrow, in Volume 1)