After Ray Tiernan, Harry's ex and Charlie's mentor, is murdered while running a secret investigation, Harry and Fergus will stop at nothing to find his killer.
Harry and Fergus take on the case of a woman who has vanished from an Irish village that has a history of devil worship. Did the missing woman stumble onto something that led to her death? Or was she murdered by somebody closer to home?
The matron of honour is poisoned at a bachelorette party even though all the others were sharing the same bottle of champagne. Harry and Fergus try to figure out how she was poisoned.
A man from Orla's past begs for her help: 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 the last one she ever wants to ask for help - Harry.
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. Fergus asks Harry to help him find the killer.