00826cam a2200205 4500 242270266 TxAuBib 20150912120000.0 780526s1936||||||||||||||||||||||||eng|u TxAuBib Dixon, Franklin W. The sinister sign post [Book] / by Franklin W. Dixon. New York : Grosset & Dunlap, 1936. 215 p. : ill. ; 20 cm. His Hardy boys mystery stories ; 15 The Hardy boys and their father solve a mystery involving inexplicable crashes of highspeed race cars being used to test an experimental turbine motor. 20150912. Mystery and detective stories. His Hardy boys mystery stories ; 15.