As her third novel featuring the Dublin Murder Squad opens, 19-year-old Frank Mackey is waiting in vain for Rosie, who he’s supposed to run away to London with. But when she doesn’t show, Frank leaves the Liberties area of Dublin and ends up in Ranelagh (another Dublin area) without her—thinking she had run off without him. He vows never to return to his dysfunctional family or the street he grew up on with Rosie, Faithful Place. Years later, though, Rosie’s suitcase is found in an abandoned house, and Frank, now a detective, returns to his old neighborhood to learn the truth of that long-ago night.

The past haunts in Tana French novels. That which was buried is brought to light and wreaks hell--on no one moreso than Frank Mackey, beloved undercover guru and burly hero first mentioned in French's second book about the Undercover Squad, The Likeness. Faithful Place is Frank's old neighborhood, the town he fled twenty-two years ago, abandoning an abusive alcoholic father, harpy mother, and two brothers and sisters who never made it out. They say going home is never easy, but for Frank, investigating the cold case of the just-discovered body of his teenage girlfriend, it is a tangled, dangerous journey, fraught with mean motivations, black secrets, and tenuous alliances. Because he is too close to the case, and because the Place (including his family) harbors a deep-rooted distrust of cops, Frank must undergo his investigation furtively, using all the skills picked up from years of undercover work to trace the killer and the events of the night that changed his life.