Single-Handed - Season 4 (2010)

The body of elderly recluse Seamus Devlin is discovered dead in a field and the initial charge is to Ruairi, a troubled teenager, who is staying at a remote youth facility. Jack is forced to keep watch on him as he gathers evidence on the death. Meanwhile, a long-lost cousin Brian and his girlfriend Gemma opens up new wounds for Jack's mother and the discovery of an uncle Jack never knew existed - a victim of the now derelict and violent industrial school for young offenders.

Jack continues his investigation into the death of Seamus Devlin and discovers a link between him and his newly found Uncle Sean going back to his uncle's days in St. Augusta's Industrial School. Meanwhile, Dennis Costello plans a major redevelopment of his pub which won't please Jack. Elsewhere, Brian considers staying on and renting after Dennis tells him that his father inherited land in the area which is now his.

Jack investigates the suspicious fire of an unfinished house which belonged to his friend Killian Kinsella. Killian informs him that he sold the house to Dennis Costello some weeks previously. Shortly afterwards the body of Killian's sister-in-law Niamh Duffy is found dead in the burnt out house. Jack suspects that Dennis had a hand in the fire and sets out to prove what happened. Meanwhile, Jack kisses his cousin's girlfriend Gemma and also finds out that Finbarr slipped plans for Dennis's nightclub past him and he is far from pleased. Elsewhere, Dennis calls in ...