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Watch Duel of Hearts online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Lady Caroline Faye meets Lord Vane Brecon and is attracted to him. When she finds out that he is being accused of a murder he did not commit, she sets out to prove him innocent, and takes a position in his family castle as a companion to his mother. She discovers that the Brecon family is not only wealthy in land and fortune, but rich in secrets lurking behind the castle walls.