Despite the star billing of Bela Lugosi and Lionel Atwill, Lugosi doesn’t have much to do and Atwill even less. There’s lots of fog in the woods surrounding the Inkston Towers mansion. When the frogs stop croaking there’s something out there and people die.
Margaret Inkston calls Dr.Lynne Harper (Irene Hervey) to come out to the Towers. Her companion and housekeeper Sarah Judd is very upset about it. Servant Milly Carson quits. Too many strange things are going on there and she wants to report it to the local constable, Cap Beggs.
Laurie the chauffeur (Leif Erickson) drives Milly towards town. He stops and tries to come on to her. She gets out of the car and hitches a ride with Jed Harmon into town. Cap tells her she doesn’t have much info to go on and something has to happen before he can act. Even the murder of a doctor in the woods isn’t enough.
Three doctors meet at the train station. One is Dr.King (Lionel Atwill). They’re all headed for Inkston Towers at the invitation of its owner Kurt Inkston. He’s paralyzed due to a botched operation involving the three.
Before they get there Milly shows up to get her things. Then a message from Rolf the butler (Bela Lugosi) goes to the guard at the gate. Milly is staying the night. He drives off. Milly comes out and wonders where he went. She starts to walk through the woods. The frogs become quiet.
Dr.Harper’s car breaks down. She hears a scream and starts to walk away from the mansion. She’s met by Dick Baldwin (Don Porter) who was driving to the mansion. He’s a frequent guest there. He writes unsuccessful horror stories. He takes Dr.Harper to the house.
She starts to talk with Margaret but Sarah tries to run interference. That night Roy wants everyone to watch a demonstration of the powers of guest Agor Singh. He’s a believer in some strange powers of yoga. He asks for complete silence. Dr.King wants nothing to do with it and storms out.
Singh goes into a trance. A skeleton appears and blood drips from its hands. Some yelling distracts Singh. He passes out and the skeleton disappears but blood spots stay on the floor. In fact blood spots have been showing up all around the house.
Milly’s body is discovered. She’s been strangled. Cap suspects Singh and wants to arrest him. He says he has to arrest somebody. Dick reminds him about how silly his story will sound in court. Huge footprints were found in the woods and Cap measured them and now wants to compare all the men in the mansions foot size.
Starting with Dr.King people are dropping like flies in the house and out of it. It all gets wrapped up in a cop out way as the writers got lazy and just decided not to write themselves out of the paper bag they got into. At least Bela and Lionel didn’t have too much screen time in this mess.