Sometimes a mystery can be what makes a movie. Sometimes, it feels like flagrant laziness. The Open House is the latter. The acting is fine, and the characters constantly and blatantly saying things like "Isn't it crazy how there could be a person hiding in your house right now?" might get in your head some, but The Open House is a far cry from any sort of actual success.
Final rating:★★ - Had some things that appeal to me, but a poor finished product.