Lost Creek (2016)

In the wake of a messy divorce, 11-year-old Peter moves with his mother to a new town. Coming to terms with his new life, Peter finds comfort playing at the nearby Lost Creek. There, he meets Maggie, a mysterious girl who quickly becomes Peter's new best friend. But, with this comes the slow realization that something in the town is wrong. Adults are disappearing, and Peter is plagued by nightmares that are becoming more and more real with each passing night. With Halloween approaching, Peter and Maggie must band together to face their fears and uncover the dark secrets of Lost Creek before it's too late. Lost Creek is a ghost story about the magical and frightening adventure of childhood, and the bittersweet feeling of coming to the end of that adventure.

Unfortunately the movie Lost Creek is not yet available on HBO Max.