Bored during a stake-out, Frank and Lu spot a befuddled-looking man with a head wound wandering the streets; when questioned, the man hasn't a clue who he is.

When DI Marlowe can't offer much help, Frank and Lu set out to discover his identity. Sebastian suspects the man's rich upon spotting an expensive watch, and Gloria lends a hand with a spot of hypnosis. The man's flashbacks lead to the illustrious Duke Vincent Hotel, although Manager Claudia Farrel, Receptionist daughter Izzie and their staff have never seen him before. But when Frank and Lu discover a patch of blood on the concrete outside, all evidence indicates that this is where our mystery man fell and lost his memory... or was he pushed? And who could hate him enough to want him dead?