Ex Cumbrian G.P. Charlotte Peterson is a vicious serial killer simmering her way through a life sentence in Rampton High Security Hospital. A sycophantic inmate with Mafia family connections had aided her escape to a murderous New York rampage six months earlier, but Charlotte only managed to actually kill one of the remaining enemies on her list. She therefore needs someone on the outside to complete the job - A Delegate. Recaptured by D.C.I. Harry Longbridge and D.I. Fran Taylor after flying to the U.S., Charlotte pulls the strings of a vulnerable woman with serious historic mental health challenges of her own. The icing on the cake for Charlotte is that the woman concerned is none other than Harry's wife, Annie. It feels good - very good. However, despite initially falling into line believing it will help with her own 'List,' Annie develops a growing inner confidence and two powerful women begin mentally circling one another. As Annie covertly pushes forwards with her own plans, the Zandini's increasingly come to the fore in more ways than one - and Charlotte starts to feel distinctly uneasy
