The show opens on a summer evening in 1984 when a 5-year-old boy vanishes in rural southern Sweden. The police investigation fails to find the truth, leaving behind rumors, suspicion and a grieving family. Twenty years later, the boy's older sister Vera is leading a group therapy session in Stockholm, when a young man describes a strangely familiar childhood memory of a disappearance. A shaken Vera travels home to her fractured family to uncover, once and for all, what really happened in the summer that never ended.