Sherlock was counting on Moriarty leaving them deliberate clues and egging them on, that was how this little game of cat and mouse worked. If he didn't go and look, if he didn't follow the breadcrumbs, then Hansel and Gretel would wind up being burned in the witch's oven. Moriarty was perfectly capable of setting up a different chase with bombs, with victims, if Sherlock didn't play the game right.

Besides, he wanted to.

Long legs took the stairs by twos and threes, leaving John behind to pay the cabbie. Unfortunately, that cab driver wasn't exactly who he should be. He got out and strong-armed John back into the back of the cab, all the doors locking and the partition closed to keep him from being able to touch the driver.

"Settle in, Dr. Watson," he said, voice rough through the little tannoy system. "We're going for a drive."