Former CIA operative is lured back to his old life when the NYPD needs his help to stop a serial killer. Dr Dylan Reinhart (Alan Cumming) is a gifted author and university professor living a quiet life teaching psychopathic behaviour to packed classes of adoring students. But when tenacious top NYPD detective Lizzie Needham (Bojana Novakovic) appeals to him to help her catch a serial murderer who is using Dylan's first book as a tutorial, Dylan is compelled by the case and comes out of retirement. Though Dylan and Lizzie initially clash, when it comes to catching killers, they realise they will make an ideal team if they both trust their instincts.