92 XIII. A VOLUNTEER 97 XIV. THE WAY IT WAS DONE 105 XV. A MYSTERIOUS DISAPPEARANCE 114 XVI. TAKING CHANCES 122 XVII. A SECRET KEPT 130 XVIII. A MYSTERIOUS SOUND 138 XIX. A FAIR PASSENGER 143 XX. MASKED FOES 151 XXI. THE SACRIFICE 159 XXII. THE RANSOM 168 XXIII. THE OUTLAWS' CAPTIVE 181 XXIV. THE TWO FUGITIVES 186 XXV. THE OUTLAW LOVER 195 XXVI. THE SECRET OUT 200 XXVII. THE DEPARTURE 210 XXVIII. THE LONE TRAIL 219 XXIX. TO WELCOME THE FAIR GUEST 223 XXX. AT THE RENDEZVOUS 231 XXXI. DOCTOR DICK TELLS THE NEWS 239 XXXII. THE MINERS' WELCOME 248 XXXIII. THE COUNCIL 252 XXXIV. A METAMORPHOSIS 259 XXXV. THE DRIVER'S LETTER 268 XXXVI. THE SCOUT ON THE WATCH 272 XXXVII. THE MINER'S MISSION 280 XXXVIII. A LEAF FROM THE PAST 288 XXXIX. THE OUTLAW'S CONFESSION 298 XL. TEARING OFF THE MASK 303

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BUFFALO BILL'S SPY TRAILER.

CHAPTER I.

THE HERMIT OF THE GRAND CAÑON.

A horseman drew rein one morning, upon the brink of the Grand Cañon of the Colorado, a mighty abyss, too vast for the eye to take in