Wyvern's Prince - The Dragons of Incendium, #3

Once, in the Kingdom of Incendium, there were twelve princesses of the realm, each a dragon shifter. Each fiery and passionate. Each possessed of an appetite for pleasure that only her destined mate can satisfy. Twelve men are expected in Incendium, each with special powers of his own, each with the gift to claim one dragon princess's heart forever. Engaged to Prince Urbanus of Regalia, Gemma knows that her fiancé ordered the assassination of her best friend-but has been told that he's her HeartKeeper.
Caught between her destiny and her moral duty, she decides to take vengeance upon Urbanus after the wedding night. Gemma's not counting on more dark revelations about Urbanus, much less his beguiling charm. Alone in his palace, Gemma can only rely upon herself to ensure her survival-or can she trust the mysterious stranger who pledges to aid her, for reasons unknown?