The Godless Boys by Naomi Wood

Imagine an alternative England, where the Church controls the country and non-believers have been exiled to a remote island. On the Island, a fierce group of boys patrols the community, searching for signs of faith and punishing any believers. When a new girl appears, arriving from the mainland to search for her long-lost mother, the gang is split: one boy falls in love with her, another seeks violent revenge. The struggle between them will change everything.

Brighton Rock by Graham Greene

A gang war is raging through the dark underworld of Brighton. Seventeen-year-old Pinkie, malign and ruthless, has killed a man. Believing he can escape retribution, he is unprepared for the courageous, life-embracing Ida Arnold. Greene's gripping thriller, exposes a world of loneliness and fear, of life lived on the 'dangerous edge of things'.