Back in 1985, Frank Mackey was a nineteen-year-old kid with a dream of escaping hisi family’s cramped flat on Faithful Place and running away to London with his girl, Rosie Daly. But on the night they were supposed to leave, Rosie didn’t show. Frank took it for granted that she’d dumped him-probably because of his alcoholic father, nutcase mother, and generally dysfunctional family. He never went home again. Neither did Rosie. Then, twenty-two years later, Rosie’s suitcase shows up behind a fireplace in a derelict house on Faithful Place, and Frank, now a detective in the Dublin Undercover squad, is going home whether he likes it or not.

Getting sucked in is a lot easier than getting out again. Frank finds himself straight back in the dark tangle of relationships he left behind. The cops working the case want him out of the way, in case loyalty to his family and community makes him a liability. Faithful Place wants him out because he’s a detective now, and the Place has never liked cops. Frank just wants to find out what happened to Rosie Daly-and he’s willing to do whatever it takes, to himself or anyone else, to get the job done.
(source)