The Sinister Signpost

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Title The Sinister Sign Post
Author Franklin W. Dixon
Language English
Series The Hardy Boys
Genre(s) Children's literature/Young adult literature
Publisher Grosset & Dunlap
Released September 1, 1936
Pages 192
ISBN ISBN 0-448-08915-7
Preceded by The Hidden Harbor Mystery
Followed by A Figure in Hiding

The Sinister Sign Post is Volume 15 in the original Hardy Boys book series published by Grosset & Dunlap

Spoiler warning: Plot and/or ending details follow.

The Hardy boys and their father solve a mystery involving inexplicable crashes of highspeed race cars being used to test an experimental turbine motor.