What Happened at Midnight
Original edition | |
| Author | Franklin W. Dixon |
|---|---|
| Language | English |
| Series | The Hardy Boys |
| Genre | Detective, mystery |
| Publisher | Grosset & Dunlap |
Publication date | May 1, 1931, revised edition 1967 |
| Publication place | United States |
| Media type | Print (hardback & paperback) |
| Pages | 173 |
| ISBN | 0-448-08910-6 |
| OCLC | 34771171 |
| Preceded by | The Great Airport Mystery |
| Followed by | While the Clock Ticked |
What Happened at Midnight is the tenth volume in the original The Hardy Boys series of mystery books for children and teens published by Grosset & Dunlap.
This book was written for the Stratemeyer Syndicate by Leslie McFarlane in 1931. Between 1959 and 1973 the first 38 volumes of this series were systematically revised as part of a project directed by Harriet Adams, Edward Stratemeyer's daughter. The original version of this book was rewritten in 1967 by Tom Mulvey resulting in two different stories with the same title.