The sinister signpost/
by Franklin W. Dixon.
- New York : Grosset & Dunlap, 1992, c1968.
- 175 p. : ill. ; 20 cm.
- Hardy boys mystery stories .
- Dixon, Franklin W. Hardy boys mystery stories. .
The attempted theft of a secret experimental motor and the kidnapping of a famous race horse are involved in a case of mysterious race car accidents that Frank and Joe are investigating.