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For the original version of this book, see What Happened at Midnight (original text).

What Happened at Midnight is the tenth volume in the Original series. It was first issued in 1931, but the text and artwork were revised and updated in 1967. The book was published by Grosset & Dunlap and produced by the Stratemeyer Syndicate.

Plot Summary

Frank and Joe Hardy are given an odd assignment by their father - to burgle the house of his client, at midnight, and retrieve a valuable new invention. They are interrupted in their endeavours by a pair of thieves but manage to fight the intruders and flee with the invention. The next night, while trying to chase off another thief intent on stealing the mysterious device, Joe is kidnapped and Frank and his pals must find him before he is taken overseas and lost forever. They look and look at the caves and they don't find him in the previovs caves then at the very top they see a cave that looks very small but they climb up the step slope and they find Joe very beat up.




Businesses and organizations



  • The Hardys have devised a series of hand-squeeze signals;
"One hard squeeze meant, 'Let's attack!' Two indicated caution. Long, short, long meant, 'We'd better scram.' An ordinary handshake was, 'Agreed.'"
— The Hardy Boys #10 - What Happened at Midnight p7
  • The Hardys have a private short-wave radio set in Fenton's study.


  • The revised text of What Happened At Midnight was issued in Great Britain as the 21st volume in the Collins series.
  • During the 1970s, What Happened At Midnight was published in Israel using the revised Grosset & Dunlap cover artwork. However, starting in 1992, the cover art was changed to a Norman Rockwell painting of an early 20th century family sitting around a table in prayer. For both the 1970s and the 1990s versions the internal artwork was the same as the Grosset & Dunlap edition.

What Happened At Midnight Israel: Hebrew language edition revised text, 1992, Hardcover


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