Pendulum (1970)

Young couple Patrick and Abigail journey to a new-age retreat in New Mexico, drawn by the possibility of healing after a traumatic event. Patrick is willing to do anything to help his wife but becomes distrustful of the retreat’s enigmatic leader even as Abigail falls under her spell. As paranoia builds, the couple must determine if the group’s unconventional spiritual practices offer genuine healing or mask a terrifying truth that threatens to consume them both.