Yup, new story. This is a post BoO fic, because, let's face it, that book left a lot of questions! The conclusion wasn't exactly the most detailed, so here is this!

This story will be eleven chapters long, as I have it planned right now, though it might change. It's not going to be that long of a story, but more of an action, quest story that really answers some of the questions from BoO, as well as exploring some things that weren't covered that much.

I hope you enjoy this story. For anyone who's interested, please check out my other stories! Enjoy, and review!

DISCLAIMER: I don't own the characters or anything you recognise as from Rick Riordan's books/world. They belong to him! This applies for everything in this story.

Leo

When Leo heard it, he didn't think much of it. Honestly strange noises were pretty common at Camp Half-Blood. An explosion? Probably nothing. A scream of pain? All the time. A hellhound's roar? Meh.

So a whistling noise wasn't exactly worrying. True it had sounded like it was coming from the sky, and it had filled his ears, but Leo was sure there was some explanation. He would've have stayed in the forges, continuing on his project, had it not been for Calypso.

It was a minute later, when she just burst in. "Leo!" Leo looked at her, a grin spreading on his face. He pulled her in to him, and despite his grimy hands, kissed her.

Sometimes Leo still couldn't believe that he had found Calypso, and rescued her. She was everything Leo had ever wanted- and everything he thought he would never get. He didn't deserve her. He made jokes, but Calypso was, to Leo, better than anything that could have ever happened to him.

"What's up, sunshine?"

Calypso smiled, but it soon faded, her face serious. "You have to come. There's something strange."

Leo followed Calypso out to the dining pavilion, albeit slightly reluctantly. He had been working on a new programme to allow demigod scent to go unnoticed by monsters- it was something which would be useful when he went out with Calypso or his other friends into New York. And, to be honest, Leo liked devoting at least a couple of hours a day to spending time in the forge. It was part of daily routine before he had set out on the quest of the seven, and it was a part of him.

They made there to the terraced area just before the dining pavilion. As everyone was making there way there, no one even gave a second glance to Leo, which was a welcome change. Nearly three weeks on since Leo had returned, the attention around him was finally starting to die.

He remembered clearly the day he came back. After rescuing Calypso from Ogygia, they had, as they had agreed upon, visited around Europe. It had been awesome- they had gone to France and Spain mostly (they both agreed to stay clear of Greece or Italy- it was too soon). Leo had figured he had only been knocked out for a couple of days, and so after two weeks Leo was yearning to go see his friends, see the casualties, let everyone know he was alright. His guilt at their suffering was gnawing at him.

"You want to go back don't you?" Calypso asked gently, as they stood in a city square in suburban Paris, the evening air warm.

Leo kissed her. "I… I have to," he admitted. As much as he loved spending the time with Calypso, he couldn't put off going back forever. "I'm sorry, if you wanted to spend longer here, or anything, but-"

Calypso cut him off with a kiss. "It's fine, Leo," she said softly. "I don't mind going anywhere- the whole world's new to me. As long as we're together," she smiled. "Though not all the time," she added wryly, "I imagine you'll get annoying after a while."

Leo gave an expression of mock hurt. "Oh, sunshine, you hurt me." Calypso just smirked as they walked down the streets.

After riding Festus, when they set down in Camp Half-Blood, unbelievably, Leo had fallen over.

So much for the dramatic entrance.

The first thing he had registered as he had gotten up from the mud was being tackled into a hug by Piper.

"Leo Valdez," she screamed, before hitting him, "where on earth- how- what?"

"Surprise," Leo said weakly.

After everyone had gathered round him, Hazel even pushing her way through the crowd to see if he was actually alive and not a ghost, they noticed Calypso.

"Is that-" Nico looked confused.

"Dude, you have a lot of explaining to do," Percy said slowly.

Leo was shaken out of his memories by reaching the destination, the terrace in front of them.

A crowd had gathered, so Leo had to push his way through to see. He came to a stop behind Annabeth, who had a frown on her face.

In the centre of the terrace was a glowing blue ball of light, about the size of a basketball, hovering five feet off the ground.

"What is it?" Leo asked, looking at Annabeth.

"I don't know. It appeared here just a minute ago, flying down from the sky. Better to leave it until we can figure it out."

Leo, as always, didn't listen. He surged forward, hand outstretched.

"Leo!" Calypso called. But it was too late. Leo's hand had touched the ball.

For a second nothing happened. Then a segment of the ball glowed white, shining brighter than the rest. Exactly 1/11th of the ball.

"What's this?" he asked, confused.

"I think I know," Annabeth said slowly. "Someone ask for Hazel, Frank and Reyna from Camp Jupiter. Get the rest of the seven too." She quickly gave orders and a few ran off. Annabeth stepped forward and placed her hand on the ball. Another segment glowed white. Annabeth nodded, as if it confirmed her suspicions. "I think it's looking for certain people. And when it has all eleven, it will… well, it will do something."

Soon Percy arrived, followed by Jason and Piper. Three more segments glowed white. The Romans were on the way, via eagle.

Annabeth seemed to have a knack for whom the ball would glow for. Drew, arrogant as ever tried, but nothing happened, and the same went for a couple of the Apollo campers.

"Calypso," Annabeth called. "Can you try?"

Calypso seemed reluctant, and Leo understood why. He knew Calypso felt different from everyone else- even though everyone loved her- and if the ball didn't glow white for her, it would be like a sign that her fears were true. She slowly stepped forward, her hand clasping the ball. Another piece turned white. She let out a small sigh in relief. Leo winked at her.

The ball glowed white for Hazel, Frank and Reyna when they arrived, but not for any of the other Romans. Someone fetched Grover, and another piece turned white.

As the people approached, Leo realised they were all heroes of Olympus- and he felt affection for all of them. These were his friends- Piper, Jason, Hazel, even Frank was like his family, the family he just made fun of. These were the people who could rely on. Leo had gone so long without a family, and now he had a huge one, plus an awesome girlfriend. Maybe this ball meant trouble, but as long as they faced it together, it couldn't be too bad right?

"That's ten, with the Romans and Grover," Piper noted. "There's still one piece left. Who?"

"Nico," Reyna said, certain it was him.

As Nico approached, Jason called out.

"Wait! When you touch the ball, it's safe to assume something will happen. Just… be ready, okay?"

Leo felt apprehension rising in him. He hadn't felt this way since Gaia. It wasn't a good sign.

Everyone nodded, and Nico touched the ball. The last segment turned white, and the ball glowed bright. For a second nothing happened, and then the ground was snatched form beneath Leo's feet, and the world turned black.

When Leo's vision cleared, it was night, and he was lying down. Leo was pretty sure it had been noon just a minute ago, but apparently Leo had been- what? Unconscious?-for several hours. He got up, the ground around him hard, with a smell of smoke in the air. Lying on the ground, sprawled nearby, was Jason and a bulldog.

He quickly got up, not sure if he his mind was playing tricks on him. Jason was stirring, and soon he got up, stretching.

"Where are we?" Jason asked. They were in a field, with several smoldering trees nearby, smoking, the tops blown off, leaving a misshapen stump. "And… why is there a bulldog?"

Suddenly the bulldog got up, and the bulldog became Frank, an embarrassed look on his face. "Uh, sorry. The blackout must have triggered my changing shape."

Leo cracked up. "You make a good bulldog, Zhang."

"Oh, shut up. Where are the others?" A chill went through Leo. Had they been separated? Where was Calypso, or the others? He hoped they were alright. Before he could respond, he was cut off.

"Oh, that's right, ignore me. By all means, talk about your friends." A voice came from right behind them. A man, hidden in shadows, illuminated by random bursts of light, was standing behind them. Leo caught a glimpse of a crackling beard, dark eyes, and a scowl set on his face. Purple lightning crashed down behind him, hundreds of bolts, but none hit him. He didn't even seem bothered.

"Um… who are you? And should we be worried?"

"Oh, you should definitely be worried," the man said calmly.

And then the lightning struck Leo.

I have no regrets about that cliffhanger.

Hope you enjoyed some Caleo, and seeing some of what happened to Leo after that ending in BoO. You'll see more of that as the story develops. And the action has begun!

For anyone who's interested, please check out my other stories, such as my PJO/HP crossover, Colliding Worlds (which I should be updating soon for those who want to know when the next chapter will be posted).

I'll try and post the next chapter when I can, it should be fairly soon, and more reviews means a quicker update since they motivate me to write quicker!

What do you think's going to happen next? Review!