4x13 - Poltergeist: The Legacy

Horton's plans to split The Legacy apart and destroy Derek begins to work as Kristin walks out and with Mordecai Church at his side he has a powerful ally to help him finish of the rest of the team. With the Boston chapter of The Legacy being almost non-existant now it is left to Derek and Nick to find out what the evil duo are up to and stop them. They try to persuade Father Callaghan, who has been helping them out, to rejoin their fight against Horton and Church and to save The Legacy from destruction.