Mackenzie Tyler is out of the hunter life. She's away at Stanford and she's happy. That is until she gets a call from her sister, she's in trouble and she needs Mackenzie's help. Mackenzie can't abandon her sister, so she packs up and leaves the life she's grown to love. On the trip to save her sister, she meets two people, hunters actually. Sam and Dean Winchester. She loves both of them, they're her friends. Well, Sam is. But Dean, there's something about him. She can't stay away. But along with being a hunter, Mackenzie has a secret. One that she will literally take to her grave.