Deep in the Woods (2000)

A group of actors heads to an isolated mansion in the woods for a performance.  When they arrive, they discover that the audience will consist of only their millionaire host and his super creepy young son.

The actors enjoy their hosts hospitality, even though he's a little odd, his butler is sketchy, and his kid stares and never says a word.

The police show up and ask if they've seen anyone in the woods.  There's a murderer on the loose and he may be in the area.  The group laughs it off.  When he leaves, they run outside to roam the woods at night.  People get separated, some purposely disappear to be together, and others wander back to the house on their own, which is when the first murder occurs.

Once the murder is discovered, they try to locate all their friends so that they can leave. When their car won't start, they realize they are trapped at the mansion. But they aren't sure who the murderer is, and whether it's the escaped lunatic, someone in the home, or maybe even one of them.

This is an okay film, but the ending wasn't very satisfying.