A haunting musical score tinged with mournful Celtic folk tunes underpins this brooding and emotionally complex drama series about the intersecting lives of three deeply flawed men: Detective Cameron Quinn, who goes undercover for his captain to nail a notorious local crime figure and clear his own name after accusations of being a dirty cop; his quarry, Jimmy Murtha, who usually manages to stay a couple of steps ahead of the law thanks to his sexy and morally ambivalent lawyer, Theresa Connors; and Danny Rooney, who is desperately trying to go straight after recently serving time for a crime he did not commit. Unfortunately, Danny's bleak job prospects force him to take dubious assignments from his childhood friend Murtha, accepting dirty money Danny hopes will help him reconcile with his drug-addicted wife, Elli, and their young daughter.