One terrifying summer can stay with you forever. It’s the summer before high school and Jacob and his friends are determined to make it a memorable one. This may be the last couple of months they have together; once school starts, they’ll be going their separate ways. Ichiro’s family is moving to Japan. And while Jacob and the twins, Hayden and Hannah, are staying behind in Valeton, they’ll be going to different high schools. When they discover an old abandoned home on a remote island of their Muskoka community, things suddenly take an unexpected turn. The kids find themselves inexplicably drawn to the house that had once been a sanatorium for children with tuberculosis and learn that it has some haunting secrets to hide.