John flinched as David's body slumped over, blood spurting out of the bullet hole through his brain. Mycroft choked, quickly turning away again and pressing his hand over his mouth as he coughed and tried not to vomit, while Sherlock turned to Marie as she stood, unmoving and staring down at David's dead body.

"Are you all right?" He asked her quietly, and Marie looked at him.

"No." She answered candidly, her emotionless delivery somehow showing the depth of just how not okay she was.

Sherlock gently took the gun from her, tossing it to the ground after Marie finally released her grip on it, before taking her shoulders in his hands as he leaned down to look her in the eye.

She was avoiding his gaze, staring blankly at the blood seeping along the cell floor though she also kept her eyes averted from the source of the blood.

"Interesting." Eurus murmured as she watched the screen avidly.

John exhaled shakily, his hands clenched into tight fists as he kept his eyes fixed on Sherlock and Marie alone, while Mycroft took a deep breath from his place against the wall.

Sherlock squeezed Marie's shoulders before turning his head so he was looking back at Eurus as he stated flatly: "All right, there you go. You got what you wanted..."

He inhaled sharply before finishing: "And he's dead."

Marie's hand twitched at her side, but she showed no other reaction while Eurus answered with a shrug: "Dead or alive, he really wasn't very interesting, but you four..."

She faced the camera again, leaning in closer as she said proudly: "You four were wonderful. Thank you."

She leaned in even closer as she continued intensely: "You see what you did, Dr. Watson." John looked at Eurus finally. "Specifically because of your moral code…"

John walked forward slightly, coming up behind Sherlock and Marie as Eurus stated pointedly: "… Because you don't want blood on your hands; you almost killed two people instead of one."

"Two people?" John repeated, both he and Sherlock frowning while Marie finally turned her head to look right at Eurus as the woman murmured: "But, you were saved from that guilt…"

Eurus fixed her eyes on Marie as she spoke: "Thanks to Victoire."

Marie's eyes narrowed on Eurus while John and Sherlock looked to Marie as Eurus continued: "I must say, I hadn't anticipated that you would shoot him."

"Your games are too easy, Eurus."

Eurus's eyes narrowed at Marie's words while John flinched slightly at Marie's cold tone as the ex-assassin stared Eurus down, continuing sharply: "You might have Sherlock and Mycroft dance for your amusement, but I was sculpted into who I am today by a psychopath."

"I know." Eurus answered just as coldly as Marie's tone, but Marie countered: "You know the facts – and you thought you would be able to read me because of what Jim told you."

Marie's eyes narrowed into slits when she continued in a low voice: "But for someone who feels neither pain nor love, you can't possibly know the lengths that someone like me can go to."

Sherlock pursed his lips while Eurus glared as Marie said icily: "You're right; a doctor like John, who took an oath to never take an innocent life, and a man who has never had blood spilled on his hands like Mycroft will never be able to break their moral code."

"However," Marie's tone went dark as she continued, "for an ex-assassin like me, who was trained by a psychopath and already painted her hands ten times over with good and bad blood... but who has also fallen in love, who knows how stupid love can make us…"

A mirthless smile appeared on her face as Marie concluded: "For someone like that, one more innocent's death makes no difference; not if it means I will save another from the same fate."

"I see." Eurus said calmly, though her eyes were burning with anger as she stared at Marie.

"Wait, I-I don't." John interjected. "What other?"

He was looking at Marie, but Sherlock was the one who responded quietly: "Eurus would have killed the wife if one of you didn't kill the Governor. She was counting on you three to fail the test, and then she would shoot both the Governor and his wife anyway."

"Why?" John asked, horrified, and Sherlock murmured: "To inspire guilt in you – to shake your core by attacking your greatest strength: your moral standard."

"Why?" John repeated, unable to believe what he was hearing, and Marie answered bitterly: "Because it's fun."

She then turned cold green eyes back on Eurus as she hissed: "But this wasn't fun, Eurus – it was too easy to see through your trick. Now."

Marie's eyes burnt with anger and challenge as she goaded: "Will you shoot David's wife? Are you going to be that predictable?"

Eurus stared back at her, before she nodded slowly.

"I see now." Eurus repeated, staring at Marie intently. "You are more surprising than I thought."

Her gaze hardened and she added flatly: "I won't be making that mistake again."

"I don't doubt it." Marie answered just as flatly, because it was true; she'd known, even before she'd challenged Eurus, that there was only one inevitable outcome from Eurus's game. She'd known the moment she'd heard Jim's voice again.

Sherlock glanced at her, but Marie didn't look at him, while Eurus pressed a button, and guards moved around behind her, going to fetch the Governor's wife and removing her from harm's way.

Eurus meanwhile sat back, suddenly back to business and returning to her composed albeit emotionless self as she ordered: "Sherlock, pick up the gun. It's your turn next."

Sherlock glanced at the pistol lying on the ground between himself and Marie as Eurus continued monotonously: "When I tell you to use it – and I will – remember the lesson from this time."

John's eyes flew to Marie in alarm, but the brunette herself looked unperturbed while Sherlock queried quietly: "What if I don't want a gun?"

"Oh, the gun is intended as a mercy." Eurus answered with a light smile, and Sherlock inquired: "For whom?"

"You." Eurus answered calmly, looking right at Sherlock.

"How so?" Sherlock demanded, looking back at his sister, and Eurus asked: "If someone else had to die, would you really want to do it with your bare hands? It would waste valuable time."

John's jaw dropped, while Mycroft's eyes flickered over to Marie and then Sherlock in horror as they let Eurus's implication sink in. Again, however, Marie was seemingly unperturbed though she pressed her lips as she stared at Eurus.

Sherlock's jaw had clenched, his face thoughtful as he turned his eyes to Marie's. She met his gaze this time, and she gave him a slight nod.

Sherlock still hesitated, his eyes moving to John, who met his gaze before he looked back at Eurus briefly.

"Probably just take it." John advised, agreeing with Marie as he looked back at Sherlock briefly before casting his eyes down.

Sherlock paused, but then bent down, picking up the gun. He pulled out the clip as he stood back up before Marie, checking it, before slotting it back into place as he turned to face the screen once more.

"There's only one bullet left." Sherlock commented, and Eurus answered calmly: "You will only need one. But you will need it."

Marie pursed her lips as she glanced quickly between John and Mycroft before looking back at Sherlock, just as they heard a click from the right side of the cell.

The group all turned to look, just as a panel on the wall slid open to reveal a narrow, hidden passageway.

"Please, go through." Eurus informed them. "There's a few tasks for you, and a girl on a plane is getting very, very scared."

Sherlock stared at Eurus for a moment longer before he turned and walked towards the opening. He reached for Marie as he went, taking her hand gently in his and she let him lead her along as they walked through the doorway while John and Mycroft followed behind.

Sherlock stopped just inside the doorway, however, turning to Mycroft as he asked quietly out of Eurus's line of sight: "Treats?"

"Yes." Mycroft answered shortly and somewhat evasively. "You know, a violin."

"In exchange for…?" Sherlock countered sharply, his eyes boring into his brother's intently.

Mycroft paused, before he answered more than a little defensively: "She's very clever."

"I'm beginning to think you're not." Sherlock answered flatly as he stared at his brother.

Mycroft's jaw locked, but he met Sherlock's gaze squarely while Marie simply watched them silently.

John glanced between them before he turned to Marie and asked the question that had been on his mind: "How did you know what that, that…"

He struggled to come up with an apt description of Eurus, but Marie answered his question, not needing to hear it in full to know what he was confused about.

"Someone like me," Marie explained quietly, "who knows only too well how desperate love can make us when we want nothing more than to save the person we love," she sighed, "but who also knows how the mind of psychopath, who feels nothing, works…"

She shrugged as she finished: "It wasn't too hard to figure out what Eurus wanted from us."

"Even so-" John began to protest, but Marie said quietly: "She wanted us to fail, and then pull the rug out from under us. But, I've been punished one too many times by Jim in the same manner in the past. I know exactly what to do, to make her not punish us."

Sherlock squeezed Marie's hand gently in his and she looked at him. The couple exchanged looks, before Marie sighed and leant her head against Sherlock's shoulder while he hugged her briefly to him.

Mycroft just watched them silently, while John suddenly recalled Marie's words that night, so long ago now, when she had revealed her true self and her haunted past.

"Punishment for failure." Marie said as they all sat in the sitting room of 221B Baker Street, and John interrupted to ask: "Punishment how? Beatings?"

"Mental torture." Marie had answered. "Or the worst – sitting back and watching others suffer for your failures. And you just had to sit and endure their screams."

And suddenly, John felt even sicker to his stomach than he had been feeling until that moment as the full weight of Marie's words back then sunk in now. As he realized exactly why the scenario with the Governor hadn't surprised Marie in the slightest.

The lights turned red in the cell behind them at that moment, and Jim's voice called cheerfully: "Come on now! Aaaaaall aboard! Choo-choo! Choo-choo!"

The group walked out completely at last, heading down the narrow passageway and into a different room. The walls were grey, like the rest of the facility, but unlike the other rooms they were also splashed with red paint, making it look like the walls were covered in blood.

Sherlock glanced around the room as he walked in first, and he noted dryly as the others followed him inside: "Someone's been redecorating."

"Is that allowed?" John asked as he also looked around in shock, but Sherlock pointed out: "She's literally taken over the asylum. We have more to worry about than her choice of colour scheme."

Sherlock wandered around the room, walking before the large windows at the far side of the room and checking them, peering down briefly at the sea below, before coming back to the centre of the room. Marie was examining the glass table that stood in the middle of the room, eyeing the envelope that was lying on it as though it were a bomb – which it very well could be.

John joined her, while Mycroft remained near the doorway, examining the walls and he commented as he ran his fingers over the red paint: "Barely dry. Recent."

"It's for our benefit." Sherlock answered shortly.

The door they had entered through slid shut just then, while the screen on the wall across from the windows lit up to reveal Eurus once more as she stated almost indulgently: "As a motivator to your continued co-operation, I'm now reconnecting you."

Lifting her remote once more, Eurus clicked it and Jim's face took her place on the screen as Sherlock's ex-nemesis called in his exaggerated American accent: "Fasten your seatbelts! It's gonna be a bumpy night."

The sound clicked, and John glanced at his friends before focusing as the little girl from before called fearfully over the speakers: "Are-are you still there?"

"Yes, hello?" Sherlock called.

There was no immediate response, and Sherlock called: "Hello. We're still here. Can you hear us?"

"Yes." The little girl answered at last, and Sherlock soothed: "Everything's gonna be all right. I just need you to tell me where you are. Outside, is it day or night?"

"Night." The girl replied swiftly.

Sherlock nodded his head, while Mycroft snapped irritably as he folded his arms across his chest: "That certainly narrows it down to half the planet."

"Shut up." Marie hissed at him under her breath as she, John, and Sherlock all shot Mycroft pointed looks, even as Sherlock asked the little girl: "What kind of a plane are you on?"

"Um, I don't know." The girl answered, her voice shaking, and Sherlock almost growled in exasperation and frustration.

"Is it big or small?" John interjected, taking over, and the girl answered immediately: "Big."

"Lots of people on it?" John asked while Marie nodded at him, agreeing with his line of questioning.

The little girl paused, before she answered: "Lots and lots, but they're all asleep; I can't wake them up."

"Where did you take off from?" Sherlock tried this time, but the girl continued over him: "Even the driver's asleep."

"No, I understand; but where did you come from?" Sherlock asked, keeping his impatience in check. "Where did the plane take off?"

"My nan's." The girl answered firmly, and Marie hung her head while Sherlock tried persistently: "And where are you going?"

"Home." The girl replied, and John looked at Sherlock worriedly while Sherlock called: "No, I mean what airport are you-"

There was a click over the speakers, and Sherlock stopped speaking while Eurus reappeared on the screen before them as she said in an almost sing-song voice: "Enough for now."

She leant in close to the camera, her eyes wide as she grinned at them while saying blithely: "Time to play a new game."

John pursed his lips together while Sherlock turned away in frustration, but Eurus ignored their irritation as she ordered: "Look on the table in front of you."

The group all glanced at the table and the single envelope on top of it, Sherlock and Marie standing on one side while John stood opposite them. Mycroft stood behind and slightly to the side of John, his arms still folded, as Eurus insisted: "Open the envelope!"

John scratched his ear in annoyance, while Mycroft lifted his head to the ceiling irritably. Sherlock meanwhile glanced at Eurus before placing the pistol he'd been given onto the table and picking up the envelope instead as she barked: "If you want to speak to the girl again, earn yourself some phone time!"

Sherlock opened the envelope, Marie and John moving so they could see over his shoulder while Mycroft snapped: "This is inhuman; this is insane!"

"Mycroft, we know." John retorted, shooting Mycroft a look.

Mycroft turned his head away, exasperated, while Sherlock and Marie ignored them completely as they went quickly over the contents of the envelope, which showed photographs of three men.

Marie glanced up as Eurus explained to them: "Six months ago, a man called Evans was murdered; unsolved… except by me."

Sherlock laid out the photos on the table so they could see them at once, while Eurus continued: "He was shot from a distance of three hundred metres with this rifle."

As she spoke, a light lit up above Sherlock's head and they all looked up to see an old-fashioned rifle sitting on a rack on the ceiling beam. Sherlock reached up, taking the gun down and starting to examine it as Eurus went on: "Now, if the police had any brains they'd realise there are three suspects, all brothers. Nathan Garrideb, Alex Garrideb and Howard Garrideb."

The trio glanced down at the photographs as she spoke, now realizing the significance of the photographs. Each one was labeled with the name of the brother depicted, and Marie frowned as Eurus added: "All these photos are up-to-date, but which one pulled the trigger, Sherlock? Which one?"