After Ray Tiernan, Harry's ex and Charlie's mentor, is murdered while running a secret investigation, Harry and Fergus stop at nothing to unmask the killer.

Harry and Fergus take on the case of a woman who vanished from an Irish village that has a history of devil worship and sacrifice.

The maid of honor is poisoned at a bachelorette party, even though others were sharing the same bottle of champagne; Harry and Fergus work to figure out how she was poisoned, but since everyone disliked her, narrowing down her killer is much harder.

A face from Orla's past begs for her assistance, as Ben Finnegan is on the run from the police, framed for murder, and being hunted by a killer with a crossbow; the only person Orla can turn to is Harry, the last one she ever wants to ask for help.

Harry, Fergus and Lola are invited to a murder-mystery party in a hotel on a secluded island; the fun quickly turns deadly as they realize a real murderer lurks among them, willing to kill everyone present.

The popular owner of Fergus's boxing gym is found murdered in the Dublin Mountains; the gym was in debt, and the dead man had trouble with both his future wife and his ex-wife.