In 1773, young English beauty Maria Bonnyfeather (Anita Louise) is the new bride of the cruel and devious middle-aged Spanish nobleman Marquis Don Luis (Claude Rains). However, she is pregnant by Denis Moore (Louis Hayward), the man she loved before being forced to marry Don Luis. After the marquis learns of his wife's affair, Don Luis takes her across Europe but Denis tracks them down at an inn, where Don Luis treacherously kills him in a sword duel.