"Unbolt the door!"    Frontispiece


Copyright, 1919, by
Howard E. Altemus


CONTENTS

[Chapter I]—Weighing Anchor for the Great Cruise[11]
     Dan is a business man. Sea orders in a jiffy. Anchorsa-weigh. The mine-sweepers at work. In the torpedo'spath. The Hun that slipped away. An indignantneutral skipper. "You vill do vat ve you tell—yes!"
[Chapter II]—"The Accursed Power of Gold!"[30]
     Dave dares Fate. A new "boss." Secret of the after-hold.Dave is disgusted. "Vat? Can't proof it you?"Sweeping for more evidence. The prize crew. Thevanishing periscope.
[Chapter III]—A Fight of the Good Old Kind[41]
     A fair hit. Distant firing. A real sea fight. The"Grigsby" turns tail. "Circle!" At deadly closequarters. Dan Dalzell scores. A stern chase. Withthe wounded.
[Chapter IV]—What a Floating Mine Did[55]
     The liner in trouble. The flash of a mine. True to histrust. Seaman Streeter is busy. A deaf jacky. Notpresent or accounted for. Rescue work. Dan protests.Dave sets the pace. Out for sterner work.
[Chapter V]—Eyes That Looked Down from the Air[63]
     Why the flash was seen. The "blimp" sighted. Aquestion out of the air. New help. The sea hornet.A narrow squeak. "Laid an egg in your path." Blimpand limp. Seaman Hedgeby enjoys himself. "Britishhot air," and Dave gets a pal's share indeed. The storyof a capture. In deadly peril.
[Chapter VI]—In the Teeth of the Channel Gale[78]
     Dave turns real helper. "I thought we were goners!"Making the grapple again. The day's work of a mine-sweeper.In a boiling sea. Life lines up. "Commandingofficer overboard!"
[Chapter VII]—In the Hour of Despair[84]
     The vanishing destroyer. Hope, then despair. Themeeting of searchlights. Fighting pluck. The ropefrom somewhere. Looped! "Ugh!" The big sleep.The "Rigsdak." A cowboy Dane.
[Chapter VIII]—Dave Meets the Fate of the Sea[95]
     From the pages of the Arabian Nights. Mr. and Mrs.Launce. The shattering jar. To the boats! No enemyin sight. The gray tower. The hail and a bad time ofit. Dave stands revealed. A German prisoner at last!
[Chapter IX]—Threats to a Prisoner[103]
     What the Danes "got." The chorus of terror. Theober-lieutenant talks. The inquisition. Talk of courtesy.Dave turns stiff. "Where have I heard thatname before?" "Things will go badly with you whenyou arrive in Germany!"
[Chapter X]—Like the French and English[109]
     Captain Kennor is polite. A look-in at the periscope."Yankee meat." Dave is tricky. Shots and a threatenedramming. "You idiot!" Dave plays for his ownfinish.
[Chapter XI]—A Victim of Courtesy[115]
     What of the woman? Mrs. Launce speaks for herself.The game of cross-bluff. An invitation bluntly refused.The turn of the prisoners. On the surface. "You areeager for death." The mystery of the Launces. "Youare the Countess of Denby!" "Save your denials foruse before a German court." Dave invited on deck."You are a good boaster." Something to interest him.
[Chapter XII]—German Brutality at Its Worst[126]
     Radio direct to Germany. Could any woman love thisfellow? Dave expresses thanks to the enemy. "Mycard." The same as confession. "A pleasant eveningfor four!" The wild brutes of the sea.
[Chapter XIII]—Facing the Planned Death[135]
     The dropping platform. Adrift! Captain Kennor, seascout. A splendid inspiration. A bully for safety.The tantalizing craft. A glow-worm of the waves.And then—! Like a dream. A bad report.
[Chapter XIV]—Dave Pledges His Word for Results[146]
     Just hospital. A treat for Dave's eyes. Days of bliss."You little patriot!" Back to duty. "The Germansare beating us." The council of war. Dave's campaignmap. Planning the Big Hunt. Something new—results.
[Chapter XV]—Darrin Suspects the German Plan[155]
     Sweeping as a fine art. Nosing out the unseen. The"Grigsby" nearly blown out of the water. A wildYankee cheer. Touching off a nest of "sea eggs." Thejob of the divers. The double find. Guessing the mine-layers'trick. The "Reed" starts something.
[Chapter XVI]—Hitting Close to the Salt Trail[164]
     The non-fighting Huns. A tame capture. Not sotame! What the search showed. "Spot the stupidones." Questioning Herr Dull-wit. The trap thatworked. German bad language.
[Chapter XVII]—Trying Out the Big, New Plan[173]
     The admiral approves. Off for the real thing. Stirringup a tidal wave. Knowing how to get the thrills outof life. Trying to run up the score. The traveller inthe haze. A ship of mystery and shots.
[Chapter XVIII]—Striking a Real Surprise[183]
     "Leave the steamship to me." The shot across thebow. A shooting game for two. "You're dealingwith the United States Navy!" Darrin proves himself.Irons for three. The summons that worked. Atough lot to handle. Juno of the Cabin. A deadlyone, too.
[Chapter XIX]—The Good Work Goes on[192]
     Dave takes a chance. So does Juno. The all-rightcargo. Who can the woman be? Dalzell has a finereport. Story of the sub-hold. Mother and daughterno longer mysteries. "The best in a six-month!"
[Chapter XX]—Darrin Turns the Tables[204]
     Weather the ship master dreads. "Look at that!"Getting the drop on Fritz. Old acquaintances. Daveis angry. The German whine. Not man enough toplay the game. "Why do you hate us Germansso?" Ever at Fate's orders.
[Chapter XXI]—On a Mission of Great Trust[215]
     The sport of kings. "Don't shoot!" begs Danny Grin.The dull wait and the sharp dash. Out to meet thehospital ship. "One of the passengers is Mrs. Darrin.""A special interest."
[Chapter XXII]—The Red Cross Tragedy[222]
     The Navy and family matters. Under treble lookout.Sighted. Big pay for a periscope. A wail of anguish.The race of rescue. S. O. S. The sight of Belle.Crowded decks. Two compartments smashed in."No use, sir."
[Chapter XXIII]—A Noble Fight without Weapons[230]
     Marine patchwork. Not enough rescue to go around."Those Red Cross women ought to be saved." Butthey decline. Dave approves. An answer to S. O. S.The fight to survive. The nurses admit defeat. Thelurking peril.
[Chapter XXIV]—Conclusion[244]
[Henry Altemus Company's Best and Least Expensive Books for Boys and Girls][253]