Up the River by Oliver Optic

We had arrived at only a partial solution of the mystery, though we had done enough to relieve Captain Blastblow from any evil intentions in the premises. What Cornwood's connection with the affair was did not yet appear. He could not have known that Nick Boomsby was on board of the Islander, for he had gone to St. Augustine, where we had put in on account of stress of weather. He could not have known that we intended to put into St. Augustine, for we had no intention to do so when we left Jacksonville.

Possibly Cornwood had put one thing and another together until he believed Nick had taken the four thousand dollars, and had made his escape in the Islander. It looked as though Cornwood had some connection with the robbery, for the Islander had hurried on her way to New Orleans, if she was bound there, as soon as the Sylvania came in sight. If he had delivered the letter to Captain Blastblow, the latter would have remained in Key West until the arrival of her owner, as instructed by the written message.