Sarah (Elizabeth Olsen) and her father came to the vacant lakeside cabin. Because it was about to be sold to someone else, the father and daughter decided to come and clean up the sanitation first, which was also a farewell ceremony. Time passed by, night gradually fell, darkness and silence enveloped the lake and the cabin. After a strange noise, Sarah called her father's name, but got no response. She searched the entire cabin, only to find that her father had disappeared from the house. As the night deepened, fear slowly filled Sarah's fragile heart. Around this cabin that was completely isolated from the outside world, it was obvious that there were some inexplicable and unknown dangers lurking. Now, Sarah can only rely on her own strength to walk out of this cabin. However, with every step she takes, she is one step closer to the secret of this cabin.