He has gone mad." No more was just then seen or heard of the crazy sailor, and the party retired for the balance of the night.
When the captain came from the yacht he brought Mrs.Cromwell and Viola with him, but left them in the small boat.
Bob quickly repeated Horton's tale.
"We must capture that madman and bind him with ropes," said Captain Sumner.
To this all, including Horton, agreed.
The descent to where the madman had disappeared was quickly made, but he could not be found.
"Hark!" cried Bob suddenly.
A wild cry of alarm arose on the cold air, coming from off the water.
"It's my mother and Miss Viola crying for help!" Bob went on.
"We must get to them at once!" returned Captain Sumner.
The party were quickly on the snow, running toward the small boat, Bob and Jack leading.
When they came in sight of the craft a scene met their gaze which filled them with horror.
The madman had boarded the boat and was in the act of shoving off.
Terror-stricken, Mrs.Cromwell and Viola shrank back on the stern sheets.
"Stop! stop!" yelled Bob.
With a snarl the madman bent to his work.

Soon the boat was in deep water.
In desperation Bob leaped into the water after it.
Ere he could reach the craft the madman picked up the long ice pole and aimed a vicious prod with it at our hero's breast.
Bob was struck squarely, and on the instant disappeared beneath the surface with the shrill laugh of the crazy sailor ringing in his ears..