Days pass, and the police investigate in excruciating detail; Larry Chaucer's wealthy father is involved. The ship is emptied completely; the silt is removed, and the internal bulkheads are removed until the "Glen Doon" is little more than an iron shell. Nothing is found. Police officers keep watch on board, and patrol-boats are stationed near the hulk, looking for any clue, as fruitless weeks pass. One night the hammering sound starts again, and as armed detectives keep watch on the deck they see: