"No," Sherlock says, evenly. "That was because my escort insisted I would be arrested if I tried to go without it."

So she did know about the sheet at Buckingham palace. He had always wondered if she actually knew or if she'd been simply guessing. Hardly important.

He glances back, and sees her hand is bleeding. It'll need attending to, but that's something to worry about later. They have to make their escape now.

"Ready?"