The Price of Possession.

After Jim Barston is mysteriously killed in Australia, his wife, Helen, lays claim to the estate of Gerald Mortimer Barston in England, asserting that her husband was the missing son and heir. In reality, Jim was the cousin of the true heir, who is also named Jim Barston. Despite having no legal proof, Helen convinces the trustees to accept her claim and is installed as mistress of the manor. Jim Barston appears and proves his identity, although Helen initially believes him to be an impostor.