Forensic investigator Reilly Steel, Quantico-trained and California-born and bred, imagined Dublin to be a far cry from bustling San Francisco, a sleepy backwater where she can lay past ghosts to rest and start anew.

She's arrived in Ireland to drag the Garda forensics team into the 21st-century plus keep tabs on her Irish-born father who's increasingly seeking solace in the bottle after a past tragedy.

But a brutal serial killer soon puts paid to that. A young man and woman are found dead in a hotel room, the gunshot wounds on their naked bodies suggesting a suicide pact. But as Reilly and the team dig deeper and more bodies are discovered, they soon realize that a twisted murderer is at work, one who seeks to upset society's norms in the most sickening way imaginable...