A recently retired English professor discovers a real knack for investigation and cannot help but interfere with the cases assigned to her police detective son.
Harry and Fergus head to the Garda station to collect Charlie, Orla, and Lola en route to Glenn and Petra’s wedding. While there, a despondent man takes the station hostage and demands that they help solve the murder of his daughter. Concerned because Harry has the ring, Glenn comes to check on them and realizes he has a die-hard situation on his hands.