01797cam a2200385 4500 424215382 TxAuBib 19040101120000.0 850814s1968||||||||||||||||||||||||eng|u 68015296 9780448089157 0448089157 9780448189154 lib. ed. 0448189151 lib. ed. 8915 Grosset & Dunlap (OCoLC)438864 DLC eng DLC OCLCQ BTCTA WGTPL OCLCO NYP TXBXL TY5 OCLCQ OCLCO OCLCF SGB TxAuBib Dixon, Franklin W. Sinister signpost. The sinister signpost / by Franklin W. Dixon. New York : Grosset & Dunlap, 1968. New York : Grosset & Dunlap, [1968] 175 p : illus ; 20 cm. 175 p. : ill. ; 20 cm. Hardy boys mystery stories ; ; 15 Danger on wheels -- Threats -- Prime suspect -- Fingerprint hunt -- A close call -- Final warning -- The elusive stranger -- Stolen! -- Demand for ransom -- Suspicious rendezvous -- A prize catch -- Startling lead -- No trespassing! -- Daring escape -- Plea for help -- Dilemma -- Emergency landing -- Night chase -- Breaking the code -- Jet action. The Hardy boys and their father solve a mystery involving inexplicable crashes of highspeed race cars being used to test an experimental turbine motor. 640 Lexile. AR 5.8 5.0. 19040101. Mystery and detective stories. Hardy Boys (Fictitious characters) Fiction. Mystery fiction. Detective and mystery stories. Hardy boys mystery stories ; ; 15.