Maybe this is a spoiler, but I don't think anyone should watch this movie without knowing the following: this movie makes no sense.
Bela Lugosi stars as a wealthy estate owner who misses his wife and thinks she is dead. But she's not dead -- the gardener keeps her in a shed in the backyard. And sometimes she escapes in a bathrobe to steal a piece of chicken from the kitchen, only to be spotted through the window by Lugosi who thinks it's a ghost. This causes him to enter a trance and kill some random person. Even after several murders (maybe dozens) in the same house, the police never suspect Lugosi.
On one occasion, they arrest the boyfriend of Lugosi's daughter and execute him. A minute later in the next scene his twin brother shows up.
If you like Lugosi, this film is decent and quite fun. But seriously, don't try to figure out why the wife is in a shed or what causes him to go into a trance or why the police are so stupid. Because you will never make sense of this preposterous film.