Just One Yesterday

Beatrice Prior was taken captive when she was just a young girl, and has lost all connection with the outside world in the time that she has been there. One day, after going through her normal routine, a boy knocks on her door saying that he has come to save her. Can Tobias actually take her away from the hell she has become accustomed to? Tris/Tobias, Completely AU/OOC.