Avon County, Pennsylvania, detective Evan Crosby is called in to investigate when several schoolgirls from well-to-do families are found murdered in the same manner. Then other girls are found dead, seemingly killed in the same way, but the new victims are Hispanic and unidentified. With the help of his girlfriend, FBI profiler Annie McCall, Crosby determines there are two killers and elects to concentrate on the case of the unclaimed girls. Crosby's romantic relationship with Annie is complicated by memories of her fiance, FBI agent Dylan Shields, who died during an FBI operation--his death unsolved. Evan, hoping to provide closure for Annie by reinvestigating Dylan's killing, makes discoveries that bear on the current cases. Evan and Annie make sympathetic leads, and Stewart effectively frames the fast-paced story with details of police investigation and profiling techniques.