Single-Handed Staffel 4 (2010)

[Part I] For Jack, the murder of a reclusive old man raises more questions than answers. Meanwhile, a visiting couple from Manchester are trying to solve their own family mystery. Jack's hunt for a killer and Brian's search for his family history lead them to the same place.

[Part II] An arson attack on an unoccupied vacation home at first looks like insurance fraud, but matters take a sinister turn when the body of a local woman is discovered in one of the rooms. When he learns why the arson victim may have been at the site of the fire, Jack has to ask awkward questions of people he considers friends.

[Part III] A local high-school girl gets too close to a dangerous highflier from Dublin with plenty of money and a bit of a past. Jack's temper gives his enemies an opportunity to bring him down. It also halts his case against a Dublin pimp and jeopardizes the safety of the schoolgirl.