A body just fell from the sky onto Hollywood Boulevard. When a beautiful prostitute is dumped onto the Walk of Fame, FBI profiler Atticus Spenser and forensic psychiatrist Dr. Caitlin Cassidy are called in to solve one of their most baffling cases yet. The media’s dubbed him the Fallen Angel Killer – a crazed murderer who’s leaving the bodies of high-priced call girls in Los Angeles tourist traps. Then the killer raises the stakes, demanding that a mysterious celebrity publically admit to his sinful secrets—or he’ll dispose of his latest kidnapped escort. With every “john” the team exposes in their search for Celebrity X, another Hollywood secret is revealed and another charmed life is left in ruins. Now time is running out, and Cassidy and Spenser will do anything to find the twisted serial killer…before another innocent woman winds up as the next grotesque tourist attraction.