The marriage of Cassandra Sherburne and the heir to the ancient family of the Dukes of Alcester was predetermined by their parents... and the girl, who has been in love with this exquisite socialite since childhood, dreams of her wedding day. However, Cassandra suddenly has a terrible thought - the Duke, who has not seen her for many years , cannot have any feelings for her! The young and innocent beauty decides to impersonate a dangerous femme fatale of the demimonde - and win the heart of her fiancé!