January 1967: stuck in a Welsh seaside town, seventeen-year-old Lily Tempest longs to break free. Her mother Melody's ambitions for her daughters are summed up in one word: marriage. But Lily would rather die first. Instead she goads her sisters into reaching for far more that they want for themselves with comic but also dark and dangerous results. As winter slides towards the summer of love however, Lily becomes increasingly aware that to leave will mean permanent exile.