If Gareth Williams was murdered, his killer left a signature of absolute control. This episode focuses on the behavioral profile of the "cleaner." Why leave the body in the bathtub? Why turn the thermostat to maximum? Why choose a red sports bag? We look at the psychological warfare of the "perfect crime"—where the lack of evidence is itself a form of evidence. We discuss whether the scene was staged to smear Williams's reputation and why the "accident" theory feels like a convenient ending to a story that the British intelligence community wanted to disappear.