Piers Morgan meets convicted murderer, Mark Riebe, a killer who has confessed multiple times to the abduction and murder of thirteen young women along Florida’s Gulf Coast. Though he is incarcerated for just one murder - and has since withdrawn all his confessions - police believe Mark Riebe is a serial killer – and one of the worst in Florida’s history. Using Mark’s own extraordinary video and audio confessions, news archive and testimony from his victim’s families, Piers explores the mind of Mark Riebe and asks what sort of man could cruelly murder these young women and then taunt the families of his victims and the police for nearly twenty years with his game of cat and mouse.