When Griffin Campbell's (Preston Oliver) father decides to quit his job in Chicago and buy The Tremont Hotel, Griffin, his younger twin siblings and his mom try to make the best of it.
After local girl Harper Dunn (Kyliegh Curran) tells Griffin and his siblings about Savannah (Elle Graham), a little girl who went missing from the nearby camp 30 years earlier, they begin to wonder if Savannah is haunting the hotel.
Things heat up when Griffin shows Harper around the rundown hotel, starting in the basement, where they discover a tunnel that leads to the outside. Only, when they look around, things are very different. The hotel is in great shape with plenty of customers and the camp has numerous kids running around. They realize they've gone back 30 years in time to the summer when Savannah disappeared, and decide to find her to keep her from disappearing.