When a body is discovered in a field in Iowa, the police uncover fourteen additional corpses, some from twenty years ago, others from the recent past. The remains point to a serial killer with an MO the authorities have seen before -- Ed Oliphant, a man who has been in prison for more than twenty years -- and is FBI Special Agent Kaely Quinn's father. After several failed attempts to discover if Ed has been training someone to be a copycat killer, the police turn to Kaely in St. Louis for help.