Full moon

Alisa is the Alpha of her pack, until one day that she had a dream that she is going to die and going to be a sacrifice but she has other things to worry about her brother, Ethan is trying to find out her secret... but some one is trying to over throw her kingdom. And the world is going to be destroyed by a group of vampires and evil and darkness is entering the world every second.
Can Alisa can saved the world from darkness or is she going to flee and be a coward? Can she trust her brother from giving away her secret?