This article is written
from the Real World
point of view
Edward Stratemeyer 002

For the original edition of this book, see The Sinister Sign Post (original text).

The Sinister Signpost
House name Franklin W. Dixon
Ghostwriter Tom Mulvey[1]
Outline Harriet S. Adams[1]
Illustrator Rudy Nappi[2]
Cover artist Rudy Nappi
Publication information
Publisher Grosset & Dunlap
Producer Stratemeyer Syndicate
Publication date 1968
Media type Hardcover
Pages 175
ISBN ISBN 0-448-08915-7
Series The Hardy Boys
Preceded by The Hidden Harbor Mystery
Followed by A Figure in Hiding


The Sinister Signpost is the 15th book in The Hardy Boys series. It was first published in 1936 as The Sinister Sign Post, with the revised and re-named edition published in 1968. Both editions were published by Grosset & Dunlap.

Plot summary

Fenton Hardy is looking into mysterious happening surrounding a series of accidents. He enlists his sons', Frank and Joe, help and they follow clues regrading a the attempted theft of a top-secret experimental engine and the kidnapping of a famous race horse. Internal summary:[3]

Racing Cars! Mystery! Adventure! These elements combine to give Frank and Joe Hardy one of the most dangerous and intriguing cases of their careers. It all starts when their father, Fenton Hardy, is engaged by an experimental race car and motor designer to investigate a series of mysterious accidents. three of his drivers have crashed because the windshields of their cars were suddenly crazed, thus cutting off forward vision. Frank and Joe uncover one slim clue. Each of the drivers had seen a signpost marked DANGER shortly before the accident. The young detectives investigate, only to discover that the signposts have vanished. What happened to them? And what sinister purpose did they serve? The attempted theft of a secret experimental motor and the kidnapping of a famous race horse are part of this thrilling case, which proves to be as sinister as the signposts themselves.


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  1. 1.0 1.1 Who Wrote the Hardy Boys? at
  2. The Sinister Sign Post Major Edition Types at The Hardy Boys Unofficial Home Page
  3. The Hardy Boys #15 The Sinister Signpost (1968)

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