BURTHON IS CONFIDENTIAL            38 V BETWEEN MAN AND MANâAND A GIRL         47 VI A BUCKING BIPLANE                      55 VII SOMETHING WRONG                        62 VIII MR. BURTHONâS PROPOSITION              71 IX THE OTHER FELLOW                       78 X A FRESH START                          83 XI ORISSA RESIGNS                         89 XII THE SPYING OF TOT TYLER                96 XIII SYBIL IS CRITICAL                     105 XIV THE FLYING FEVER                      113 XV A FINAL TEST                          122 XVI THE OPENING GUN                       132 XVII A CURIOUS ACCIDENT                    139 XVIII THE ONE TO BLAME                      144 XIX PLANNING THE CAMPAIGN                 155 XX UNCLE AND NIECE                       164 XXI MR. H. CHESTERTON RADLEY-TODD         174 XXII THE FLYING GIRL                       184 XXIII A BATTLE IN THE AIR                   192 XXIV THE CRIMINAL                          202 XXV THE REAL HEROINE                      215 XXVI OF COURSE                             222