Debra can't believe what she sees: her boyfriend Richard is in bed with someone else! Furious, she packs her bags and flees to her mother's, where she decides to look for a new apartment. She soon finds an open-minded Shauna and the two quickly become friends. After a while, Debra notices the strange Simon in the house next door. She begins to harness him - initially just to pass the time. What seems harmless at first suddenly turns out to be her undoing. Debra observes Simon killing a woman. Or so it seems. Is Debra a witness to the murder or has she simply been deceived? Out of fear, she keeps quiet and tries to solve the case herself. But in doing so, she puts herself in grave danger...