Nancy Drew & Hardy Boys Super Mystery (sometimes styled SuperMystery) is a crossover spin-off book series featuring Nancy Drew teaming up with The Hardy Boys. It shares continuity with the The Nancy Drew Files series and the Hardy Boys Casefiles series.
Two additional books were planned but never released:
- Book #37, The Playhouse Mystery, was to be written by Louise Munro Foley. The ISBN would presumably have been 0-671-00740-8.
- Book #38, untitled. It was listed as forthcoming on an online book sales site. The ISBN was to be 0-671-00741-6.
- In 2007, with the debut of the Nancy Drew and the Hardy Boys Super Mystery series, the majority of fans started to call this series Nancy Drew and Hardy Boys SuperMystery '88 and the 2007 series Nancy Drew and Hardy Boys Super Mystery '07 in order to cut down on confusion when talking about the separate series.
- Wikipedia: Super Mystery
- Hardy Boys Wiki: Nancy Drew and Hardy Boys SuperMystery
- NancyDrew.info: Super Mystery
- NancyDrewSleuth.com: Nancy Drew & Hardy Boys Super Mysteries
- HardyBoysCasefiles.com: The Nancy Drew and Hardy Boys Super Mysteries