Season four picks up a year after season three, and business couldn't be better at the Wild/Reid Detective Agency as Harry and Fergus welcome an unexpected client: Charlie Wild. Elsewhere, Harry is hired by a friend and former wild child turned nun, Lola stumbles upon a dance school mystery, a Dublin literary tour takes a bloody turn and more.

Meanwhile, Fergus' hopes of going to college at the same time as Lola are threatened when she gets an incredible offer to study abroad.