Monica Rivers is the owner of a traveling circus that is plagued by a series of mysterious deaths. When a high-wire performer becomes the first victim, he is replaced by Frank Hawkins, an even more daring aerialist. But Frank's attentions to Monica make her business manager, Dorando, jealous. After Dorando becomes the brutal killer's next victim, Police Superintendent Brooks arrives at the scene. With motives such as jealousy and revenge, the mystery is not easy to unravel.