Michael Harding returns home from military school to find his mother happily in a relationship with David Harris, a seemingly perfect man who quickly becomes part of the family. Despite David's charm and helpful nature, Michael is suspicious of his new stepfather's intentions and begins to investigate his background. As he digs deeper, Michael discovers inconsistencies in David's past and starts to believe that the man living in their home may not be who he claims to be. Tension rises as Michael's suspicions grow, putting a strain on his relationship with his mother and revealing cracks in the family's harmonious facade.

As Michael continues to uncover more about David, he finds disturbing evidence suggesting that David has a dark and violent history. The seemingly idyllic life that David has built with Michael's mother becomes increasingly precarious as Michael's persistence threatens to expose the truth. The sense of impending danger escalates, and Michael realizes that protecting his family may require confronting the sinister reality behind David's mask. Amid the growing paranoia and mounting evidence, Michael must navigate through doubt and fear to secure the safety of his loved ones before it's too late.