1950s Liverpool: in the tight-knit Irish Catholic community of the Four Streets, two girls are growing up. One is motherless—and hated by the cold woman who is determined to take her dead mother's place. The other is hiding a dreadful secret which she dare not let slip to anyone, lest it rips the heart out of the community. What can the people of the Four Streets do when a betrayal at the very heart of their world comes to light?