Marie de Flor (Jeanette MacDonald), a glamorous Canadian prima donna, is renowned for her beauty, exquisite voice and fierce temperament. When news arrives that her brother Jack (Jimmy Stewart in one of his earliest screen roles) has been wounded in a prison escape, Marie realizes she must go to him despite the danger. Lured into the wilderness, she encounters Sgt. Bruce (Nelson Eddy), who is hunting the fugitive. Sgt. Bruce is soon hot on Marie's trail as well!