In Insidious Intent, Tony and Carol are on the hunt for a serial killer who victimizes women at weddings without a date--and forces the duo to confront their most haunting moral dilemma so far.

In the north of England, single women are beginning to disappear from weddings. A pattern soon becomes clear: Someone is crashing the festivities and luring the women away--only to leave the victims' bodies in their own burned-out cars in remote locations. Tony and Carol are called upon to investigate--but this may be the toughest case they've ever had to face. Meanwhile, Detective Sergeant Paula McIntyre and her partner Elinor must deal with a cruel cyber-blackmailer targeting their teenage ward, Torin.