Inspector Scott, an obsessive investigator who has set up a special section for unsolved cases at the London Metropolitan Police. Noing, an alien who came to Earth because he wanted to be a great detective, suddenly came and decided to try to unravel the labyrinth case that shakes the citizens of London! Thanks to Noing's super-technical device that sees everything on Earth, the criminal is immediately identified, but no evidence of arrest is available. So what does Inspector Scott do? This is a reversal mystery!