Unnur has secrets. A single mother to a beloved daughter, she lives a quiet life working at a bakery. She has spent years pushing away haunting half-remembrances of the last summer of her childhood, when her otherworldly friend, Freyja, disappeared from a black-sand beach in the remote Dark Valley. Unnur’s safety --- and her daughter’s --- now hinges on discretion. Yet when her ex-husband returns to Iceland and brings with him a new girlfriend who seems to know more about Unnur than she’s letting on, Unnur may finally have to face the chilling possibility that she is responsible for her friend’s presumed death. As a cold case investigation reopens and the intricate threads of past and present begin to tangle, Unnur must race to recover the broken memory of what happened all those years ago or risk losing her daughter.