As the Clara Ann sails toward Panama, Jimmy has discovered the secret of the Whistling Ghost. In a thick fog, he and the boy who posed as the ghost are washed overboard. Can Clark break away from Barnaby to rescue his missing friend? Of course, the boys are pulled from the water at the last moment, but when they arrive back on the Clara Ann, Mike “Pug” Flanagan’s appearance causes a stir. Is he the real whistler, or not?