Allison Winchester

Two thousand years ago, the witch Qetsiyah gave Silas two gifts: immortality for him and herself... and a darker miracle for the girl he refused to leave behind-his little sister, Anastasia.

Bound to the wheel of return, Anastasia was cursed to rise again and again, ensuring Silas would never face eternity alone.

Now, she's Allison Winchester, half-sister to Sam and Dean, raised on rock salt and holy water. A hunter forged from loss, the kind who never misses when it counts.

The story begins in Supernatural Season 1: salt lines, cheap motels, and a father's secret. By the end of Season 3, the hellhounds come-and everything crumbles.

In the aftermath, Sheriff Elizabeth Forbes calls for help from a hunter named John Winchester.
With no word from Sam, Allison goes alone. Bobby Singer puts her in touch with a vampire hunter, Alaric Saltzman, and Allison walks straight into a town of founders and fangs, doppelgängers and douchebags.

Every life she's lived is bleeding through. Every choice she makes bends two worlds. And somewhere out there, an ancient brother still believes he knows the girl she once was.

Begins: The Vampire Diaries, Season 1 - Episode 18 (Under Control)
Flashback chapters: Supernatural, Seasons 1-3 (leading to Dean's death)

Eventual pairing: Niklaus Mikaelson / Allison Winchester