Berserk (1967)

Monica Rivers is the owner and ringmaster of a traveling circus, and she'll stop at nothing to draw bigger audiences. When a series of mysterious murders occurs and some of her performers die gruesomely, her profits soar. She hires high-wire walker Frank Hawkins, impressed by the handsome and muscular young man. They begin an affair which arouses her previous lover Durando's jealousy. When Durando is found dead shortly afterward, the other performers become alarmed, as a mysterious killer is obviously loose in their midst. Many suspect Monica herself of the killings, especially Matilda, who has set her sights on Monica's new lover. At this point, Monica's unruly 16-year-old daughter Angela is expelled from school for being incorrigible, and Monica is forced to take her into the circus, allowing her to become the partner of knife-thrower Gustavo. Meanwhile, the dead bodies continue to pile up.