Isabel Besson's father owns a French Equestrian Circus in which she grew up, touring throughout France and performing with her brilliant horse, Alonzo.
In the audience at a performance in London is Leo Sommers, Earl of Camden, who is stunned when he sees in Isabel the replica of his famous great-grandmother, whose portrait hangs in his drawing room.
This is no coincidence, as it soon comes to light that Isabel had been kidnapped as an infant and adopted by Papa and his wife when an En.