serial killer is on the loose in San Diego, and he has a most unusual M.O.: With each kill, he leaves behind objects with unclear meanings. Most of the recent killings are centered near Kendra Michaels’ home and office, so its no great surprise when the FBI shows up at her door. The investigators soon discover that the left-behind objects are souvenirs of other unsolved serial murder cases in various U.S. cities. Kendra realizes that the killer has come to challenge and taunt her. The investigators become his newest targets, even as Kendra begins to suspect that one of them may be the killer himself. Kendra must risk everything to find the killer and defeat a psychopath whose terrifying plan is years in the making.