Duel of Hearts (1991)

Lady Caroline Faye (Alison Doody) meets Lord Vane Brecon (Benedict Taylor) 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.