What is the plot of Knock at the Cabin?

Knock at the Cabin is a horror movie about a group of friends who go on a weekend trip to a cabin in the woods. When they arrive, they find an old man at the door warning them to stay away and that something is waiting inside. They ignore his warnings and enter the cabin, only to discover that it is haunted by a malevolent spirit. The group soon finds themselves in a fight for their lives as the spirit starts to terrorize and kill them one by one. The spirit has the ability to move through walls, and it uses this power to get closer and closer to the group. They must find out how to stop the spirit before it can kill them all. As they search the cabin for clues, they must also face their own fears and insecurities as they battle the evil spirit. In the end, they must use all of their courage and strength to finally defeat the spirit and escape the cabin alive.