On the morning of the third day after their arrival at Para the Grampus slipped down the river toward the open sea. She carried confident hearts and determined wills—and, in spite of the fact that all had their eyes on the “dark side of the picture,” there was plenty of hope and also of good cheer in the stout steel hull of the submarine. For Bob Steele was in command. He had brought the Grampus through many perils, and all had faith to believe that he could bring her through many more.

THE END.

The Motor Boat Series

Donald Grayson’s Famous Motor Stories for Boys

Mr. Grayson is an accomplished writer of up-to-the-minute juvenile stories which are eagerly read by modern American lads.

In his new series his characters have exciting adventures with every kind of motor-driven machines—motor cycles, automobiles, aeroplanes and submarines.

You may readily see what a vast field for adventures Mr. Grayson has chosen.

Now Ready