Much of madness, more of sin

Haunted by the maddening voices of her mind, Robin grasps at Martin Ensley's steadying hand. But far from lifting Robin out of misery, Martin and his wife, Celia, draw her deeper into the darkness of insanity as they satisfy twisted urges kept secret even from each other. Barely able to function beneath the weight of normal life, Robin struggles to escape this killing pair with her mind and life intact.