Deadly Manor (1990)

It's a dark and stormy night. Three teenage couples head out, searching for a local lake to camp by. Unfortunately, the one friend who recommended the camping site can't quite remember how to get there. They begin to hope that luck is on their side, when they pickup a hitchhiker who knows the area well.

But, night is falling, they have hours left to go before they can reach their destination, and the weather is turning worse and worse. They decide to pull off on a side road to find a place to camp for the night. But, instead of finding a camp site, they come upon what appears to be a deserted old mansion. The girls all quickly come to feel that the mansion is hiding something sinister. They sense a menacingly air about the place. Despite the girl's objections, their boyfriends insist that they will remain there for the night. You'd think the coffins they found in the basement would be enough to change their minds. But, that's kids for you! Soon.. They discover that this is more than an abandoned house. It is a mansion where lust and murder rule. Soon the members of the group start turning up dead, and the teenagers realize that they're not alone.