After spending her whole childhood fighting her father's claim that she was born in evil, Mariella thought she had set up the perfect life with the perfect husband and perfect children. One night, when her husband Dominic comes home covered in blood, Mariella's life changes forever. Triggered by the traumatic event, she plunges into a terrifying psychological decline that threatens her life as well the lives of her family. With her family oblivious to her declining state, can her long lost sister Helen reach out to her before it's too late?