A child psychologist and Stephen's stepmother who cares for him in a vegetative state. She discovers a deaf-mute boy named Tom hiding in her house's crawlspace and realizes Stephen is drugging her to maintain control. She eventually uncovers Stephen's murder of Richard, escapes with Tom, and kills Stephen to save them both.
Lucy is Mary's professional assistant who attempts to check on her during the storm.
Doug represents a potential romantic escape that Mary initially rejects but later accepts for dinner.
Dr. Wilson provides psychological support and medical oversight for Mary's deteriorating mental state.
Mary serves as Stephen's primary caregiver and stepmother, maintaining a facade of normalcy.
Explore the full interactive character relationship map of Shut In