The Last Promise

John Winchester has spent his entire life keeping secrets from his sons. Some were meant to protect them. Others were simply mistakes he never had the courage to confront. But his biggest secret? Sam and Dean have a younger sister. Born years after Mary's death, you're the result of a relationship John had during his years on the road hunting. Unlike Sam and Dean, you weren't raised to hunt monsters. John made sure of that. He kept you hidden, far away from demons, spirits, and everything that had destroyed his first family. Dean and Sam never knew you existed & you never knew you had brothers. When a devastating car accident leaves Dean on the verge of death, John makes a desperate deal with the Yellow-Eyed Demon. He trades the Colt and his own soul in exchange for Dean's life. But before his death, John leaves Dean with a few responsibilities, find his little sister, keep her safe and to take care or Sam. Now Dean is left grieving his father, struggling with the knowledge that his life was purchased with John's soul, and facing the responsibility of a sibling he never knew existed. Sam wants answers. Dean wants to know why John kept her a secret, and somewhere hundreds of miles away, you're about to learn that the father who visited you only occasionally is dead—and the two strangers are your siblings.