Sarah (Elizabeth Olsen Elizabeth Olsen) and her father come to the lake house, which has been vacant for a long time, because it is about to be sold to others, so the father and daughter decide to come and clean up first, which is also a farewell ceremony. As time went by, night fell, darkness and stillness enveloped the lake and covered the hut. After a strange noise, Sarah called her father's name, but there was no answer. she searched the whole cabin, only to find that her father had disappeared from the house. As the night gets deeper and deeper, fear slowly fills Sarah's fragile mind, and it is clear that there are some unknown dangers lurking around the hut, which is completely isolated from the outside world. Today, Sarah can only get out of the cabin on her own, but with each step she takes, she is one step closer to the secret of the hut.