Scotland Yard is on the hunt for the mysterious Mister X. One player takes on the role of Mister X, while the others are detectives. An exciting chase begins as everyone travels across the city by taxi, bus, or subway. However, Mister X remains unrecognizable to the detectives. The only clue they have are his tickets. Where will he go next? Across the Thames? Back to Buckingham Palace? To catch Mister X, the detectives must work well together and coordinate their efforts. Caution: Mister X loves to outsmart everyone, secretly using a ferry and covering his tracks. If fewer than four detectives are playing, they receive support from jointly played Bobbies. Mister X wins if he can travel through London until the end of the last round without being caught by Scotland Yard. The detectives win if one of them is on the same station as Mister X at the same time. Excitement until the last second is guaranteed!.