Bloody Hunters!

Casey West moved to Lawrence, Kansas from London, England when she was 16. Her father was looking for the demon that killed her mom and brother. Her father goes missing, and she finds out a few months later that the demon killed her dad. She sets out to find said demon, and about a year and a half later, she meets a group known as Team Free Will, consisting of Dean Winchester, Sam Winchester, and Castiel. But TFW has a new addition, called Jack Kline. Casey tells the story of her father and they offer to help her, but she doesn't want help. She can do it her own, and she doesn't need anyone.