A determined American detective on the hunt for a vicious psychopathic killer in her new UK hometown of Cardiff.

It is a story about Rebecca, a detective who had left the US in search of a new life in the UK. Initially, her goals are to be taken seriously enough to be assigned a major case concerning a serial murderer. The more Rebecca delves into the case, the more Rebecca is at risk of uncovering the secrets of her own dark past; the reason she left America, her identity and her affiliation with a notorious criminal sisterhood.

An American detective in the UK attempts to distance herself from her past life, enthralled by an ongoing case of a puzzle-creating anonymous psychopath. However, unbeknownst to her, she isn't the only one in the department to keep skeletons in the cupboard and her past life may not be interested in letting her go that easily.