Heartsease (1913)

Eric Temple is a composer whose rival, both in romance and work, is Sir Geoffrey Pomfret , a nobleman with few scruples. The woman they both love is Margaret, the daughter of Lord Neville. To get rid of his competition, Pomfret tells Lord Neville that his wife, Lady Neville, is in love with Eric. Then, when Eric is attacked by thugs and lays unconscious in a hospital, he steals his opera too.