“There are traitors on board, sir,” said Frank quietly.

Lord Hastings bounded to his feet.

“What is that you say?” he exclaimed. “Traitors? It is impossible. You should be more careful of your language.”

“It is true, sir,” said Jack. “We overheard them plotting last night.”

Lord Hastings slowly resumed his seat.

“I know you must have good reason for your words,” he replied; “but I can scarcely credit them. Who are these traitors?”

“Well,” said Frank, “one of them is the man who followed Jack and me in London. He is a sailor on board, but, owing to a false mustache, I did not recognize him until last night.”

“And the other?” queried Lord Hastings.

“The other,” said Frank, “you will find it very hard to believe is plotting against England. He is an officer on board, sir.”

“His name?” demanded Lord Hastings.