Die drei Fragezeichen ("The three Investigators", literally "The Three Question Marks") is a series of juvenile detective books, created by American writer Robert Arthur in 1964. In Germany, the series became very popular and was continued by German writers, even when the original American book series ended in 1987. Today the franchise has gained cult status amongst German fans, especially the recorded audio plays ("Hörspiele") that were first published in 1979. Over 150 episodes have been released since then.

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