A graphic adventure in 4 parts from Thriller Picture Library #432, November 1962 - 64 pages.
While investigating a man at a Swedish port, Spy 13 mistakenly follows the wrong person and ends up nabbed by that man, a ship captain, and his crew. After interrogation where David Doughty revealed nothing, he was chained and thrown overboard. He barely survived but now he is very interested in what those men had to hide worth killing him.