The Viscount and the Vixen by Lorraine Heath

Love begets madness. Viscount Locksley watched it happen to his father after his cherished wife's death. But when his sire arranges to marry flame-haired fortune hunter Portia Gadstone, Locke is compelled to take drastic measures to stop the stunning beauty from taking advantage of the marquess. A marriage of mutual pleasure could be convenient, indeed... as long as inconvenient feelings don't interfere.

Desperation forced Portia to agree to marry a madman. The arrangement will offer the protection she needs. Or so she believes until the marquess's distractingly handsome son peruses the fine print... and takes his father's place!

Now the sedate--and, more importantly, secure--union Portia planned has been tossed in favor of one simmering with wicked temptation and potential heartbreak. Because as she begins to fall for her devilishly seductive husband, her dark secrets surface and threaten to ruin them both--unless Locke is willing to risk all and open his heart to love.

This book is part of the "The Hellions of Havisham" series.
Here are some other books from this series: