Satan’s Blade 1984

In November 1981, two female bank robbers, Ruth and Trish, pull off a $50,000 heist after killing two tellers in cold blood. They hole up at a snowbound mountain cabin resort while waiting to rendezvous with their partner, George. As they wait, Ruth grows greedy and shoots Trish to death. She plans to do the same to George when he arrives, but an unseen assailant stabs her in the back as she drags Trish’s body away. Ben, the local sheriff, and another officer arrive at the cabin after gunfire is reported, and discover the bodies.

The next day, two married couples arrive at the resort to celebrate Tony [Tom Bongiorno]’s graduation from law school and passing of the bar examination. Simultaneously, a group of college girls arrive with a friend whose father has recently died. Despite warnings about the murders and a local legend about a murderous mountain man who comes from the bottom of a nearby lake, the college girls take the cabin next door.

During the night, one of the young women has a nightmare of a man murdering her and everyone else. The following day, Stephanie Leigh Steel meets Tony on the lake, and the two talk. Stephanie ends up spending the afternoon with Tony, while her friends stay back at their cabin. That night, an unseen killer enters the girls’ cabin and systematically stabs each of them to death.

Stephanie returns to the cabin later and discovers all of her friends have been murdered. She retreats to Tony and his friends’ cabin, which the killer eventually breaches, murdering everyone inside except for Stephanie, who hides under a bed. The following morning, Deputy Sheriff Ski stabs Stephanie in the stomach. When she asks why, he admits that he simply wanted the money stowed in the cabin, and that he didn’t want to hurt anyone; however, he alternately explains that he is possessed and brandishes a knife that is a talisman. Stephanie flees back into the cabin, but Ski follows, chasing her up the staircase, where he tackles her to the floor and stabs her to death. Afterwards, Ski throws the knife in the lake. The Sheriff arrives and calls Ski “George,” revealing that Ski is the unseen accomplice of the bank robbers who appeared at the start of the film.

Later, a hand emerges from the lake and throws the knife back out, the blade sticking in the side of a tree. A man hiking through the woods notices the knife and dislodges it from the tree bark.