The flickering torch mystery

When two suspicious plane accidents occur near an eastern airport, the two Hardy brothers investigate the case and find themselves in greater danger than they anticipated.

Grosset & Dunlap
1971
9780448089225
book
Lexile: 
650

Holdings

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374938958622247851217928ALEE89ALEE18790Mystery Fiction Dix100015754856551709567815
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212367656870372464851217928HIVE259HIVE060320FIC MYSTERY DIX100015825759371742569409
225661058061561276851217928LIS287T0300077Fic Dix100016159188961615918896
228383358278562262851217928GENE223GENE44735FIC DIX100016170249331709567815
238538359165772368851217928BLE110BLE0009820F DIX100016377766271736800991
273530462268702381851217928GMI291GMG0009944SER HB100016377825731736800991
274213662331472382851217928GMM293GMS0004978FIC DIX100016377825731736800991