Deduction card game based on the Three Investigators stories. The 3 ??? are Jupiter, Bob and Pete (in the German version - Justus, Bob and Peter). There are 3 types of suspect cards, place cards and mystery cards and 3 cards which show all 9, plus 3 detective cards (Justus, Bob and Peter), 4 player pieces and the gameboard.
Guess the gameplay could be described as Cluedo meets Go Fish!