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.
A fellow P.I., Harry Benedict, inveigles his way into Harry’s life by sending her a particularly perplexing case. As Harry and Fergus attempt to work out how it’s possible for a mystery writer to shoot himself in a locked panic room without a gun, they find the key to cracking the case might come from a very surprising source.