The Vampire Bat

When the villagers of Kleinschloss begin to bleed to death, the town elders begin to suspect vampires, but police inspector Karl Bretschneider is skeptical.

Local scientist Dr. Otto von Neumann, who cares for the victims, visits Martha Mueller, who was attacked by a bat. At the same time, a mentally disabled man named Herman Gleib also comes to see Martha, who claims that he loves bats because they are "cute" and "soft as cats".

On the way home, the doctor meets Kringen – one of the townspeople, who claims that he was attacked by a vampire in the form of a bat. He doesn't tell anyone about it, so as not to spread panic in the city. Dr. von Neumann encourages him to tell his story to other townspeople. Kringen begins to suspect that the vampire may be Herman, who is obsessed with bats. Gleib collects them on the street and even lives with them as Pets.

Dr. von Neumann returns to his home, which is also home to Bretschneider's lover Ruth Bertin, her hypochondriac aunt Gussie Schnappmann, and servants Emil Borst and Gorgiana.

Fear of the vampire and suspicion of Gleib quickly spread through the city, and people begin to fear him. During the night, miss Mueller is killed. The results of an examination of her body by Dr. von Neumann and another doctor, Dr. Haupt, show that the cause of death is the same as that of the previous victims – loss of blood through two wounds in the neck, most likely caused by sharp teeth. Gleib enters the morgue, and when he sees miss Mueller's body, he runs away screaming.

The next morning, Gleib sneaks into Dr. von Neumann's garden while the scientist, Bretschneider, and Bertin discuss the vampires in the house. The town elders arrive and announce that Kringen is dead and Gleib is missing. An angry mob tracks down gleib and chases him through the countryside to a cave, where He falls off a cliff and crashes to his death.

At night, Dr. von Neumann telepathically controls Emil Borst, forcing him to bring the sleeping Gorgiana to the scientist's laboratory, where a strange unknown organism is located. Then they put a special device around her neck and drain her blood.

Soon, Chapman discovers the lifeless body Gordiani in her bed. Dr. von Neumann and Bretschneider search the room and find miss Mueller's crucifix, which gleib held in His hands when the scientist visited her. Bretschneider becomes increasingly convinced of the presence of vampires in the village, as no other plausible explanation can be found. Gleib was seen in von Neumann's garden this morning, and it seems obvious that He is also responsible for Gorgiana's death.

However, Bretschneider changes his mind after learning of Gleib's death long before Gorgiana was killed. Dr. von Neumann suggests that Bretschneider go home and take sleeping pills, but instead gives him poison, intending to take His blood later. Bertin discovers that Dr. von Neumann is telepathically controlling Borst, who is in Bretschneider's house. It turns out that Dr. von Neumann created an artificial life form and uses human blood to feed the artificial body. He binds Bertin in his lab. Enter Borst with Bretschneider's body on a cart. Dr. von Neumann approaches Borst, who turns out to be Bretschneider in a suit, with Borst on a cart. Bretschneider points the gun at Dr. von Neumann and goes to untie Bertin. Dr. von Neumann then fights Bretschneider, who drops the gun. As they fight, Borst raises his gun and shoots Dr. von Neumann, then kills himself.