Pathologist Pierce uncovers a deadly conspiracy when he links a string of seemingly accidental deaths through cryptic music tattoos. As he brings Harry and Fergus in on the case, secrets unravel, and an act of revenge spirals toward another kill.

After her husband Damien's body is burned in a fire, Laura needs Harry's help to clear her of the murder. Harry and Fergus must dive into a murky family history steeped in whiskey and curious acts of sabotage.