Katherine does not like to owe someone, but when it's the other way, she does everything to get her favour in return. Dean refuses to truly become a demon, while Katherine desperately needs to be one. And by the time spent in hell together, they develop something like friendship; But will it be only this when they finally get out?

Sam and Dean are on another case in a small town in Virginia. While they're investigating they meet a vampire, who is completely different than all they've ever dealt with. That vampire is not just someone, but the manipulative Katherine Pierce. She needs help and offers herself in return. While Sam has a bad feeling for her, Dean likes Katherine, maybe even more than he wants to.