Forgotten, The Bittersweet Vampire Chronicles, Book 3

Lying about her identity, Ariel is allowed sanctuary in the vampire lair of her worst enemy--but she's secretly there to avenge her family. Playing nice--ok, nice enough--she patiently awaits the return of the oldest of three vampire brothers...the one she intends to kill. Unfortunately, she overhears a plot against her people and attempts to flee in order to warn her beloved family. This third book in The Bittersweet Vampire Chronicles begins with her waking up with amnesia after an untimely accident. She is flustered to find the most handsome, deadliest-looking warrior in her room and even more so when she finds out they're supposedly engaged. But she's confused. What are all these weird powers & abilities? And why are her chaotic dreams--filled with the possessive antics of two handsome warriors--not matching up to the life story that the vampire told her?
She has forgotten her mission: Ariel came here to KILL their leader... not marry him.