He'll talk to his own Sherlock about it when he gets back, he thinks. Maybe Sherlock has his own set of latent memories that needs a nudge.

And if it doesn't work quite like that, then Sherlock is at least the only person John knows who won't make a discreet phone call to the nearest insane asylum after the conversation is done.

"I don't think it's dramatic enough for him," he says, "though if anyone could swoop in an oatmeal-colored jumper, it'd be Sherlock."