A detective with no one to trust. A killer with nothing to lose 18 months after the 'Ragdoll' murders, a body is found hanging from Brooklyn Bridge, the word 'BAIT' carved into the chest. In London a copycat killer strikes, branded with the word 'PUPPET', forcing DCI Emily Baxter into an uneasy partnership with the detectives on the case, Special Agents Rouche and Curtis. Each time they trace a suspect, the killer is one step ahead. With the body count rising on both sides of the Atlantic, can they learn to trust each other and identify who is holding the strings before it is too late?