With expert movie craftsman Karl Brown at the helm, Under the Big Top is one of the greatest cinematic displays of acrobatics in the history of movie making. Penny (Anne Nagel) is the star trapeze artist in the biggest circus in America. Traveling with her loving, though overbearing, mother, Penny is flying high. She then finds romance with one of her trapeze partners, but the other male partner is not pleased about this development. The sexual tension between the three acrobats builds, ever mirrored in their precarious artform, building to a dangerously high climax! Under the Big Top is a dazzling journey through World War II era circus performing and the twists and turns of the human heart.