The seven members of the Knight family live happily together until one day when they discover that Joe Knight, the owner of the farm, has drawn all the money out of the bank and keeps it in a suitcase under his bed, with a loaded shotgun for company. A few weeks later Joe is found dying inside his bedroom but the money has disappeared. One of the six remaining Knights has worked out how to steal the family fortune from inside a locked room. But which one? It takes them a long time to find out.