Marie de Flor (Jeanette MacDonald) is a Canadian soprano performing in ''Roméo et Juliette'' in Montreal; the Premier of Quebec is in the audience. Inviting him and his entourage to supper after the performance, she learns from a 'half-breed' man called Boniface (George Regas), that her brother Jack, supposedly in prison for armed robbery, was wounded as he escaped from prison and has killed a Royal Canadian Mounted Police in the process. Making her excuses, she leaves for the Canadian wilderness with Boniface, hoping to help Jack.