Hippy Wingate falls into the desert. A happy accident. "Water! I
smell it!" cries Grace. Signal shots are fired. A desert wanderer
rides in begging for water. A solitary horseman views the
Overlanders from afar.


CHAPTER XV--THE GUIDE READS A DESERT TRAIL

A stranger's warning interests Hi Lang. Why the desert wanderer is
always listening. More desert secrets revealed. Emma Dean dreams
of snakes and things. Grace Harlowe is complimented. Hi tells the
Overlanders what the mysterious horseman is.


CHAPTER XVI--THE CROSS ON THE DESERT

Grace learns to throw the lasso. An unpleasant discovery. The
mystery box at the foot of the cross. Emma is eager to see their
find opened. "It rattles like gold," declares Hippy. Lieutenant
Wingate raises the cover of the mystery box.


CHAPTER XVII--ANOTHER MYSTERY TO SOLVE

What the Overland Riders found in the buried tin box. The map that
aroused the curiosity of all. "I'll bury the old thing," declares
Hippy. Hi Lang empties his rifle at the mysterious horseman, and
later makes discoveries.