COMPULSION opens as police detective North Anderson, a close friend of Clevenger's, calls him with a piece of chilling news: one of the infant twin daughters of billionaire Darwin Bishop has been murdered in her crib at the family's estate on the exclusive island of Nantucket. Plastic sealant injected from a tube was used to block her esophagus. Worse, the suspected killer is her adopted teenage brother, Billy. The Bishops are a deeply troubled family: As handsome as he is ambitious and cruel, Darwin seems determined to protect his son -- or is actually trying to railroad him? Why does the other adopted Bishop son, Garrett, a good-looking talented athlete, despise his father so intensely? Is beautiful Julia Bishop a mother grieving for her murdered child -- or a manipulative seductress with a dark secret to hide? As Clevenger becomes convinced that Billy may be innocent, it becomes clear that the killer is intimate with the family and is circling another victim -- the remaining twin. Using his brilliant mastery of the tools of psychiatry, Clevenger lays a trap to force the killer to reveal himself in an unforgettable finale.