Jason is a werewolf by birth, vampire by bite. When he was changed into a vampire-werewolf hybrid, he is shunned by his family and pack. He wandered the earth until he met the Cullens. They take him as part of their family. From then on, he vows to protect them. They also lead him to his mate, who he will protect. His mate is Olivia, Bella's younger sister. They will have to face enemies to be together.