Seven Keys to Baldpate

It's a bit absurd. Too many situations where one person leaves and another one entering, all story long, and a way too convenient. But it's good fun with plenty of characters from gangsters, to mystery women and women haters, and with a solid cast playing them. Gene Raymond is the main star as the author thinking he had the place to himself, but one by one people come. And with that you get most of what you need for solid 'old dark house' story that'll satisfy any mystery fan.