When Derek Malory, son of the Marquis of Haverston, ventures into a den of iniquity with his cousin, the last item he expects to acquire is a mistress. Yet acquire one he does, in the form of Kelsey Langton. Kelsey is being auctioned off to save her family from financial ruin when Derek steps in to save her from a sadistic buyer. Despite an unorthodox introduction, Derek falls in love with Kelsey, but how will the heir to the Malory title and fortune explain to his father that he loves his mistress and wants to marry her?