"Fire!"

Three muskets were leveled at the swimmer, but Bob was not going to be in the track of the shot.

He dived, and when he arose again to the surface he was a good many points to the east, and was out of range of their vision.

A new sensation diverted the attention of the crew.

"Murder!" shouted one of the watch, as he stumbled over the dead body of the murdered officer.

The crew gathered around.

Captain Scott looked at the lieutenant's body and asked:

"Who has done it?"

"I found him there, sir," answered the man.

"I'll find out who has done this, and he shall pay for it. Beat to quarters and let the roll be called."