The discovery of several adult sex toys, abandoned in a reservoir, and the body of a woman found seventeen miles away is the beginning of a shocking investigation.

Police begin the extensive investigation into Elaine's murder by uncovering an obsessive and bizarre relationship. Disturbing text messages reveal a psychopath grooming his trusting victim under the guise of sadomasochistic practice and shockingly demonstrate the bloodlust obsessions of the killer and the level to which his victim was willing to acquiesce. But unlike a killer with mental illness or some criminal motivation, the chief suspect is the opposite of what police expect.

The investigation and a many threads of evidence eventually identify the manipulative killer, leading to the longest trial in Irish criminal history.