"Guess we can go up after him now," replied Lord Hastings.

He led the way.

"Careful, sir, when you go up," warned Jack. "He's likely to be waiting for one of us to show a head."

Lord Hastings paid no heed to this command, but sprang quickly up. He gazed around rapidly. There was not another soul on deck.

"Come on," he cried to Frank and Jack.

The latter also sprang up and looked about.

"Where is he, sir?" asked Frank.

"Gone," replied Lord Hastings. "Must have jumped overboard."

He swept the sea with his eyes, as did the others.

"What's that over there, sir?" asked Jack suddenly.