Count Wilfred von Hagen is a specialist on blood diseases and conducts experiment sin his castle. When his niece Ulla came to visit him, she had an accident and was in need of a blood transfusion. Due to the storm the bridge to the town was damaged and no one in the castle had her rare blood type, Wilfred decided to use the wolf as a donor. Ulla was healed and all seemed well. During the party to celebrate her recovery, Ulla however transformed into a werewolf and attacked Wilfred’s lover Ilona. Wilfred was forced to knock Ulla out and drugged both the girls to give him time to shut the party down. Wilfred sent even his servants home, so he would be alone to deal with the things to come. He waked Ilona first and tried to convince her that it was just a regular wolf whom escaped from his lab that had attacked her, but Ilona remembered everything and wanted Ulla locked up in nuthouse or by police. Ulla also woke up and Ilona tried to leave. Wilfred closed the castle’s gate, which slammed onto Ilona’s car, knocking her out. Wilfed and Ulla decided that only way to keep her secret is to kill Ilona. Wilfred wanted to use drugs, but when Ilona woke up before he could administer it, Ulla made a decision to feed her to the wolf. Wilfred wanted to cure Ulla, and she wanted it too, but Ulla was impatient, she wanted it done immediately, threatening to leave the next day if no cure can be found. Wilfred didn’t want to loose Ulla, as he had grown to love her. He went into her room at night and raped her. During the assault, Ulla transformed into werewolf and killed Wilfred. He then threw his body to the wolves and called the police and lied it being an accident, which they believed.
