The new Bates Motel is a tourist attraction, a recreation of the murder site, and the developers are already counting their profits. And there's a new exhibit, one nobody expected: the bloody corpse of a teenage girl crumpled in the front hall, stabbed to death. Among the avalanche of press and publicity is reporter Amelia Haines, true-crime book writer. She's studying the original Psycho killings and to Amy, the new murders are a golden opportunity-if she can be part of the investigation, perhaps track down the killer herself, then her fame, and her fortune, will be assured. But catching the madman won't be easy . . . the town is full of suspects, and Amy's best informants keep turning up murdered. If she isn't careful, Amelia Haines may be the next permanent guest at the Bates Motel. . . . <P>