1) Young adult novel series
Found on
https://www.crosswordclues.com/clue/supermystery
The Hardy Boys teamed up with Nancy Drew in this now-discontinued 36 volume series of paperbacks. This is not the first time the trio have crossed paths; earlier crossovers include the 1970s TV series, the novelization of one of the TV episodes (The Hardy Boys and Nancy Drew Meet Dracula), two SuperSleuth books (each book contains 7 short stories)...
Found on
http://en.wikipedia.org/wiki/Supermystery
No exact match found.
