"When a Stranger Calls" is a horror film that follows a young babysitter named Jill Johnson. While watching the children, she receives unsettling phone calls from an unknown caller who asks her to check on the kids. As the calls become increasingly threatening, Jill realizes that the danger is much closer than she initially thought. The film is known for its suspenseful atmosphere and iconic opening sequence. It explores themes of fear and vulnerability, highlighting the tension between safety and danger in familiar settings. The story has inspired various adaptations and remains a classic in the horror genre.