He was known as the Diamond Duke Alexander Moretti is a man who had been brought up on the streets of London, fending for himself since he was a young boy. Over the years, he grows to hate his father, The Duke of St Albans for abandoning both Alexander and his mother, when she needed him the most. Press-Ganged when he was a young man, he serves in the navy for some years. When he finally leaves and returns to London, he vows to become a wealthy man. Years later, when he meets a beautiful, strong-willed woman, he is drawn to her courage and loyalty to her family, and finds himself wanting to see her again and again. When fate deals him a stroke of luck and he finds himself the new Duke of St Albans, there is only one woman he wants for his duchess.

Lady Catherine Beauchamp is absolutely furious when she learns that her younger brother has sold her diamonds to a man known as The Diamond Duke. She goes to London to retrieve the diamonds and when she meets the man who has her jewels, she is immediately attracted to him even though she tries to fight it. When Alexander Moretti suddenly enters London Society, she cannot ignore the overwhelming feelings she has for him. Will love let Catherine take a chance on The Diamond Duke?