The Forbidden Prince (Dracula's Bloodline Book 5)

Tristan DeKnight is Lord Dracula's left hand. He's hard, ruthless, and never fails in his missions. But when he's sent to deliver a secret potion to Isolde Serpaint, Dracula's extended family, things go terribly wrong.Tristan meets Isolde's abusive husband, Mark, and all bets are off - they've met before, and they owe each other a debt of blood. Problem is, Tristan is trapped among Mark's men, a lone vampire among serpents. To make things worse, circumstances force him and Isolde to drink the love potion that was meant for someone else. Soon, they are sucked into a forbidden love affair that may cost them both their lives.