On the lam, criminal Alonzo hides in the circus as The Armless Wonder – a performer who uses his feet to hurl knives. Alonzo keeps the arms he really has concealed to hide his identity. Meanwhile, ringmaster's daughter Nanon has a phobia of being touched by men, but is romantically pursued by not only Alonzo but the strongman Malabar. Alonzo's desperation to remain with Nanon will only end in tragedy.
Sir Borotyn, a prominent Prague resident, is discovered murdered in his home, with all indications pointing to a vampire assault. The victim's friend, Baron Otto, and the physician who analyzes the body are certain that the vampire is the mysterious Count Mora, or perhaps his daughter, but receive little help from the law. Professor Zelen, an expert in the occult, is called in to assist with the investigation.
Wrongfully convicted of a robbery and murder, Paul Lavond breaks out of prison with a genius scientist who has devised a way to shrink humans. When the scientist dies during the escape, Lavond heads for his lab, using the shrinking technology to get even with those who framed him and vindicate himself in both the public eye and the eyes of his daughter, Lorraine. When an accident leaves a crazed assistant dead, however, Lavond must again make an escape.
