as Jupiter, Nick Price as Pete, and Cameron Monaghan as Bob. It was followed in 2009 by The Three Investigators and the Secret of Terror Castle. Although adopting the same titles as two of the novels, and some of the characters, the stories in the films are significantly different from those in the books on which they are based. In Germany, the franchise has also been adapted into audioplays and graphic novels. References Further reading Björn Akstinat, Das ABC der drei Fragezeichen (ABC of The Three Investigators), Baden-Baden: Humboldt-Verlag, 2008. Armin Paul Frank, Das englische und amerikanische Hörspiel. München: Fink, 1981. External links Three Investigators Site T3I Readers' Site TunnelTwo.com rocky-beach.com Juvenile series Fictional amateur detectives Mystery novels by series Book series introduced in 1964