C is for Corpse(1986)

Sue Grafton

Kinsey meets him in the local gym. Bobby Callahan is a scarred young man struggling back to life after a car forced his Porsche over the edge of a canyon, battering his body and muddling his memory. All he remembers is that someone, for some reason, tried to kill him. Desperate for clues about his own past life and certain he is being stalked, he asks Kinsey to protect him. Kinsey can't resist the brave kid - and neither can the killers. Three days late Bobby is dead. Kinsey Millhone never welshed on a deal. She'd been hired to stop a killing. Now she'd find the killer.