IRS Agent Noelle Parrish knows how to keep business and pleasure separate. When the death of her latest audit subject leaves her to complete her work with his nephew and sole heir, Antonio Cristobal, she's only worried about making it back home in time for her 30th birthday bash. But the seductive and powerful Antonio turns out to be a code section the IRS never addressed, and he's more than rule-abiding Noelle can resist. Despite her best efforts to stay on task, she is caught up in his secretive and passionate world. Trapped at the Cristobal mansion by a massive snowstorm, Noelle discovers an unnerving fact about the centuries-long line of Cristobal men...they are all the same man. Determined to unravel the secret of his unnaturally long life, Noelle is catapulted into a battle that has been brewing for six centuries. Two rivals will fight to the death over this secret, and the winner will decide Noelle's fate.