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Watch The Stranger Within online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Mare's life is dominated by the kidnapping of her three year old little boy. After 12 years, she is pleasantly surprised to find Mark standing before her on the doorstep pretending to be her son. Her joy eventually turns into fear and panic after it becomes clear that the young man is a dangerous psychopath.