When, a month after the incident, the girl turns up dead and the guy disappears, Milo Sturgis is called in to solve the case (and goes to his favorite psychologist-cum-side-kick Alex Delaware for advice about their behavior). The two then work together to solve the case.
The book is a really easy read. It rattles along at a fair old pace. Kellerman really knows how to tell a story, but I got a little irritated by the way he portrays struggling actors. I don't expect them all to be Lawrence Olivier (or even a regular on General Hospital), but I got a little irritated with quite how shallowly they're portrayed. They're presented as "beautiful people" types with little (if any) curiosity about the world around them. I think he could have done better than the cardboard cut out style characterization he achieved for some of this secondary characters.