A shivering young woman leans against a lamppost on London's most notorious street of ill repute.

Chastity Armitage is on the run from her lecherous stepfather. Desperate for food and lodging for her siblings, she takes to the streets. She never expected a tall, handsome man to appear from the mist and change her life forever. A choice lies before her: continue down the path of never-ending poverty or become the baron's mistress.

Asher Colborne, Baron Wenlock, is shocked to discover the dressed-in-rags lady is Chastity Armitage, a young woman who had caught his attention at a ball three years past. Asher offers his assistance, but Chastity suggests a carnal contract. As a member of The Rakes of St. Regent's Park, Asher is well aware of what such an agreement will portend.

Despite the scorching attraction, they decide to keep an emotionless business arrangement in place. That pact soon falls apart, as they cannot deny their intense feelings. Many obstacles lay in Chastity and Asher's path. For the baron and the mistress, embracing true love will be their most challenging impediment.