From Thriller Picture Library #343, December 1960.
The year is 1943. The Japanese have conquered much of Southeast Asia and the British resistance is weakening, largely through disease. A noted expert on treating these tropical troubles is a man named Mortimer who is trapped in Switzerland. John Steel is sent to rescue the man before Japanese agents can snatch him themselves. Months later, it is learned he has been recaptured by the Japanese and is being held in the Maru prison camp in Burma.