Chapter I

The Comet

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Chapter II

An Involuntary Passenger

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Chapter III

On the Wing

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Chapter IV

A Mysterious Visitor

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Chapter V

Something Wrong

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Chapter VI

The Stolen Biplane

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Chapter VII

Found

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Chapter VIII

Something of a Mystery

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Chapter IX

The Path of the Eagle

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Chapter X

A Midnight Alarm

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Chapter XI

In Peril

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Chapter XII

The Secret Told

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Chapter XIII

An Exciting Moment

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Chapter XIV

The Tramp Monoplane

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Chapter XV

Strictly Business

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Chapter XVI

A Siberian Adventure

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Chapter XVII

A Grateful Friend

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Chapter XVIII

In Strange Lands

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Chapter XIX

Strange Companions

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Chapter XX

Rescued

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Chapter XXI

War

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Chapter XXII

Lost in the Air

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Chapter XXIIII

The Blazing Beacon

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Chapter XXIV

The Home Stretch

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Chapter XXV

Conclusion

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