Dead Man's Trigger (S03E06)

Harry and Fergus stop by the Garda station to pick up Charlie, Orla, and Lola before heading to Glenn and Petra’s wedding. However, things take a turn when a distressed man holds the station at gunpoint, insisting they assist him in finding his daughter's murderer. Worried since Harry is carrying the wedding ring, Glenn arrives to check on them, only to discover he’s facing a serious crisis.