Warning: This post contains spoilers for Heretic. When two young Mormon missionaries find themselves locked in a menacing battle of wills with a suave but sinister stranger, the tenets of their faith are tested as they fight to make it out of his maze of a prison-house alive. In the opening minutes of Heretic, now in theaters, Sister Paxton (The Fabelmans‘ Chloe East) and Sister Barnes (Yellowjackets‘ Sophie Thatcher) accept an invitation to enter the home of a seemingly kindly older man named Mr.