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.