Freshly transferred to his hometown from Dublin, Garda Sergeant Jack Driscoll probes the carbon monoxide poisoning of a young immigrant woman. The investigation threatens to expose dirty secrets kept by a few local men -- including, perhaps, his father.

After toddler Conal Burke disappears, his mother accuses her estranged husband of snatching him. Jack desperately tries to locate the boy and his father before Conal's two violent uncles get involved.

Jack heroically pulls 17-year-old Daniel O'Malley out of the bay -- too late to save him. The mystery surrounding the teenager's death deepens when Jack learns that his old flame has been vacationing at a cottage overlooking the exact spot where Daniel drowned.

[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.