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Guarding a world-famous stamp collection which is locked in a bombproof vault hardly seems a dangerous assignment. But the Protectors will need all their guile when they come up against a brilliant criminal.
An injured railwayman, a loop-line rendezvous at midnight: clues which the Protectors must crack to discover the headquarters of a gang of hijackers - and deliver a young man from a life of crime.
The SIS team find themselves up against a gang who intend to infiltrate a union to play a sordid game of industrial espionage which could destroy a union official and his family.