Aldis is working in a juvenile detention centre in rural Iceland. She witnesses something deeply disturbing in the middle of the night; soon afterwards, two of the boys at the centre are dead. Decades later, single father Odinn is looking into alleged abuse at the centre following the unexplained death of the colleague who was previously running the investigation. The more he finds out, though, the more it seems the odd events of the 1970s are linked to the accident that killed his ex-wife. Was her death something more sinister?