Compulsion (Unabridged‪)‬

A young woman who disappeared into the black night; a retired school teacher stabbed to death in broad daylight and two women butchered in a beauty parlour. Three murder cases, linked only by a perplexing lack of motive.

But then LAPD detective Milo Sturgis and psychologist Alex Delaware are called to the scene of a bizarre "crime". A stolen car has been anonymously returned to its owner, undamaged and unblemished - except for a tiny, solitary bloodstain. This minuscule clue is enough to set the pair on a hunt for a multiple killer, who proves to be a fleeting shape-shifter, defying identification. To unmask him, Alex and Milo will have to confront the true face of murderous compulsion...