Table of Contents

I [THE DEN OF DISGUISES]

II [THE MYSTERIOUS RUSSIAN]

III [TREACHERY OUT OF THE NIGHT]

IV [A NARROW ESCAPE]

V ["FRIEND? ENEMY?"]

VI ["NOW I SHALL KILL YOU"]

VII [SAVED FROM THE MOB]

VIII [WHEN AN ESKIMO BECOMES A JAP]

IX [JOHNNY'S FREE-FOR-ALL]

X [THE JAP GIRL IN PERIL]

XI [A FACE IN THE NIGHT]

XII ["GET THAT MAN"]

XIII [BACK TO OLD CHICAGO]

XIV [THE MYSTERY OF THE CHICAGO RIVER]

XV [THE CAT CRY OF THE UNDERWORLD]

XVI [CIO-CIO-SAN BETRAYED]

XVII [A THREE-CORNERED BATTLE]

XVIII [HANADA'S SECRET]

XIX ["I SEEN IT—A SUBMARINE!"]

XX [AT THE BOTTOM OF THE RIVER]

XXI [THE OWNER OF THE DIAMONDS]