CHAPTER I—WHEN THE COWBOYS LAUGHED

Picking out the ponies for the desert journey. The Overland girls meet Hi Lang. Grace selects an "outlaw" pony. "Don't reckon you'll be able to stick on him," warns the guide. Grace Harlowe flings herself into the saddle, braced for the shock.

CHAPTER II—AN "OUTLAW" MEETS HIS MATCH

Grace fights a stubborn battle with the vicious bronco. "Look out!" yells the guide. "Wall, ef thet don't beat the Dutch!" exclaims a cowboy. A fainting conqueror. Cowboys voice their admiration of the Overland girl, and Bud offers his services in the event of trouble.

CHAPTER III—A THRILLING MOMENT

Enthusiastic plainsmen give Grace a Mexican lasso. The start for the desert. A rousing good-bye that ends in disaster. Elfreda and Grace accomplish a difficult feat. "Hang on! We'll stop him!" The runaway bronco is thrown. "They're caught!"

CHAPTER IV—PING WING MAKES A DISCOVERY

Elfreda confesses to being "all mussed up," and gives first aid to an injured cowboy. The lure of the desert. Welcomed at their first camp by Ping Wing. The Chinaman as a songbird. The Overland Eiders are aroused by cries and shots.

CHAPTER V—STALKING A MOUNTAIN MYSTERY

Ping uses a frying pan and a can of tomatoes as his weapons. Scooting for a mysterious foe. "Put up your hands! I have you covered!" Grace Harlowe exchanges shots with her adversary, then suddenly sinks out of sight.

CHAPTER VI—INTO THE GREAT SILENCE

Hi stalks an unseen enemy and wings him. The hole in the mountain. "The hound! He hit her! I'll kill him for that!" Grace, unconscious, is carried into camp. "This is not a gunshot wound!" Bullets are fired into the camp of the Overlanders.

CHAPTER VII—THE FIRST DESERT CAMP

Hi Lang shows his charges how to make a campfire on the desert. A water hole is found. "Some one is trying to poison us!" groans Hippy. The guide warns the campers against scorpions. Emma Dean wishes she had gone to the seashore.

CHAPTER VIII—CALLERS DROP IN

Amid scenes of desolation. "A party of horsemen coming this way!" The Overland party prepares for trouble. Hippy is doused by a wild desert rider. "Get off my desert!" orders Lieutenant Wingate. The leader is kicked into a water hole. The battle at the water hole.

CHAPTER IX—PIRATES GET A HOT RECEPTION

Bullets fly fast in the desert camp. Grace protests against Hi Lang's order to shoot the attackers' ponies. Miss Briggs dresses the wounds of the victims. The guide reads danger signals in the sky.

CHAPTER X—WHEN THE BLOW FELL

"It's here!" mutters Hi Lang. Enveloped in a wild desert sandstorm. "Down! Everybody down!" Overland girls nearly buried under drifting sands, and camp equipment is wrecked and blown away. "The water hole is lost!" announces the guide.