Eilis Lacey is Irish, married to Tony Fiorello, a plumber and one of four Italian American brothers, all of whom live in neighboring houses on a cul-de-sac in Lindenhurst, Long Island, with their wives and children and Tony's parents, a huge extended family. It is the spring of 1976 and Eilis is now forty with two teenage children. Though her ties to Ireland remain stronger than those that hold her to her new land and home, she has not returned in decades.

One day, when Tony is at work an Irishman comes to the door asking for Eilis by name. He tells her that his wife is pregnant with Tony's child and that when the baby is born, he will not raise it but instead deposit it on Eilis's doorstep. It is what Eilis does--and what she refuses to do--in response to this stunning news that makes Tóibín's novel so riveting and suspenseful.