Biggles becomes involved in four undercover operations in this third bumper omnibus edition of his classic adventure stories that take him from the icy wastes of Antarctica to war-torn Korea. In Biggles' Second Case, Biggles hunts for a wartime German submarine, the U-517, whose ruthless captain, Von Shonbeck, has escaped to the Antarctic with a horde of stolen gold bullion. In Biggles Breaks the Silence, Biggles is back in the Antarctic once again, tracking down a ship frozen in the pack ice with a hold full of treasure, and doing battle with a gang of desperate villains while attempting to recover the ship's cargo. In Biggles Gets His Men, Biggles is tasked with the dangerous mission of finding and rescuing a group of important scientists who have been kidnapped and smuggled to a remote region of China. Finally, in Biggles Follows On, Biggles comes up against his arch enemy, Erich Von Stalhein, and teams up with Gimlet King's special forces unit behind enemy lines in China.