Amnesia is just another case to solve. In fact, it's a challenge that Sherlock could even enjoy. It's easy, really; he can deduce it all. The tottering old lady is his housekeeper. The man with the silver hair, his boss. The worried girl..infatuated. And as for John Watson? His husband. Obviously.

When a visiting noble attacks Arthur with the intent to kill, Merlin is forced to openly use magic to save his life. With execution less than 24 hours away, a desperate Arthur tricks Merlin into binding their souls in order to prevent his death.