A successful psychologist in Boulder, Colorado, Alan Gregory has a bright future -- until police find one of his female patients dead. In her apartment, they discover a diary describing her sexual obsession with Gregory and his willing involvement. Obligated to keep his patient records confidential -- even from the police -- Alan faces disgrace and ruin unless he reveals what he knows about her fantasies and his own innocence.

But when more of his patients die and Alan becomes the prime suspect, he is desperate to clear his name. Unable to turn to anyone for help, he begins the painful search for the explanation on his own -- and soon discovers the terrible truth. Now, only he knows how to stop the killing...if he doesn't wind up dead himself.