Discovering best friend's betrayal with my boyfriend, I lash out. I invite her over, ready to confront her. During our explosive fight, a tragic shove sends her plummeting down the stairs. She's dead. Panicked, I fumble for my phone to call the cops. But out of the shadows, a mysterious voice hisses: "Manslaughter? Three to ten years. Make that call, and your life's over. Do as I say if you want to walk away."