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What is Len Deighton’s most famous book?

English spy novelist Len Deighton’s most famous book is his first, The Ipcress File (1962). An account of deception and betrayal in an espionage agency, it was an immediate best-seller, selling out its initial print run of 4,000 copies within a day. Deighton, a former freelance graphic artist, reportedly wrote the book “for a lark.” In 1965 it was adapted into a film starring Michael Caine.