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The Hardy boys and their father solve a mystery involving inexplicable crashes of highspeed race cars being used to test an experimental turbine motor.Tags
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In one of the most dangerous and intriguing cases of their careers, Frank and Joe Hardy help their father investigate a series of mysterious car accidents. Each of the drivers had seen a signpost marked DANGER shortly before his accident. The young detectives investigate, only to discover that the signposts have vanished. 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.
This screamed predictable, even with the boys working closely with their dad on this case, but a surprise twist made it enjoyable.
The Hardy boys and their father solve a mystery involving inexplicable crashes of high-speed racecars being used to test an experimental turbine motor.
Near fine condition
Near fine condition
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Author Information

622 Works 117,309 Members
Franklin W. Dixon Franklin W. Dixon is actually a pseudonym for any number of ghostwriters who have had the distinction of writing stories for the Hardy Boys series. The series was originally created by Edward Stratmeyer in 1926, the same mastermind of the Nancy Drew detective series, Tom Swift, the Rover Boys and other characters. While show more Stratmeyer created the outlines for the original series, it was Canadian writer Leslie McFarlane who breathed life to the stories and created the persona Franklin W. Dixon. McFarlane wrote for the series for over twenty years and is credited with success of the early collection of stories. As the series became more popular, it was pared down, the format changed and new ghostwriters added their own flavor to the stories. Part of the draw of the Hardy Boys is that as the authors changed, so to did the times and the story lines. While there is no one true author of the series, each ghostwriter can be given credit for enhancing the life of this series and never unveiling that there really is no Franklin W. Dixon. (Bowker Author Biography) show less
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Common Knowledge
- Canonical title
- The Sinister Signpost
- Original title
- The sinister sign post
- Original publication date
- 1936; 1968 (revised) (revised)
- People/Characters
- Frank Hardy; Joe Hardy; Fenton Hardy
- First words
- "I'm glad there is peace and quiet in the air this morning," said Mrs. Hardy, stirring her coffee.
- Last words
- (Click to show. Warning: May contain spoilers.)"Hurray!" yelled the Hardy boys, doubling up with laughter.
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- 1,444
- Popularity
- 16,206
- Reviews
- 8
- Rating
- (3.44)
- Languages
- 6 — Dutch, English, Korean, Norwegian (Bokmål), Norwegian, Swedish
- Media
- Paper, Ebook
- ISBNs
- 15
- ASINs
- 28
























































