What Happened At Midnight, The Hardy Boys Mystery Stories #10 in the series. Author: Franklin W. Dixon. 217 printed pages pages. Hardcover book, no dust jacket. Publisher: Grosset & Dunlap, copyright 1931, printed circa 1957 in the U.S.A.

The 1957 printing has brown multi-scene endpapers, and a 4-page info ad for the Rick Brant Adventure Series at the end of the book.

Synopsis:  What Happened at Midnight (Book #10 in the original series by Franklin W. Dixon) follows Frank and Joe Hardy as they investigate a strange nighttime incident involving a stolen secret invention and a case of mistaken identity.

When their friend Jack Dodd’s father is forced to hand over important engineering plans to a gang of criminals, the Hardy boys step in to help recover the stolen documents. Their search leads them through a series of dangerous encounters — from a late-night brawl at a jewelry store to a chase involving an airplane and a daring escape from a locked room. Along the way, they unravel a smuggling ring and discover the truth about what really happened at midnight, ultimately bringing the culprits to justice.

It’s a fast-paced tale mixing burglary, kidnapping, and plenty of cliffhangers in classic Hardy Boys style.

Condition: The book is in very good plus condition with no noticeable problems. (see photos).