Jack is babysitting for the summer on an isolated island with no Wi-Fi, no cell service, and no one else around but a housekeeper and two very peculiar children. He immediately senses something sinister—and it's not just the creepy black house he's living in. Soon he is feeling terribly isolated and alone, but then he discovers there are others. The problem is, he's the only who can see them. As secrets are revealed and darker truths surface, Jack desperately struggles to maintain a grip on reality. He knows what he sees, and he isn't crazy... Or is he?