It's one thing to discover your brother is dead, and it's another to realize you must become alpha before the next winter solstice or risk dying yourself. Add that to the fact that you must be mated before the ceremony and you find yourself in Jasper's shoes.
Jasper has to find his mate, which he does, only to discover Adah is the sheriff's daughter, human, and a powerful werewolf hunter. Now all he has to do is make her see they belong together, turn her and make her his mate. Easy pissy right?