Icelandic sisters Arora and Isafold live in different countries and aren't on speaking terms, but when their mother loses contact with Isafold, Arora reluctantly returns to Iceland to find her sister. But she soon realises that her sister isn't avoiding her . . . she has disappeared, without trace. As she confronts Isafold's abusive, drug-dealing boyfriend Bjorn, and begins to probe her sister's reclusive neighbours - who have their own reasons for staying out of sight - Arora is led into an ever-darker web of intrigue and manipulation. Baffled by the conflicting details of her sister's life, and blinded by the shiveringly bright midnight sun of the Icelandic summer, Arora enlists the help of police officer Daniel, as she tries to track her sister's movements, and begins to tail Bjorn - but she isn't the only one watching . . .