The Next Alpha

Zack and Luke may be twins but they are total opposites. Zack is the pack bad boy while Luke is the golden boy. The only thing they have in common is that their both next in line for the title of alpha of the largest and most powerful pack. Eclipse.
but only one can claim the title. The one who finds his mate first.
Zack doesnt want to be alpha, he wants to travel the world but Luke wants to be alpha more then anything even if has to lie about finding his mate.
But when zack meets the new girl Sara,he knows she is her mate. How will this change he's plans about traveling? how would Luke handle having his brother find his mate before him?