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The Riddle of the Sands: A Record of Secret Service is a patriotic British 1903 novel by Erskine Childers.

It is a novel that "owes a lot to the wonderful adventure novels of writers like Rider Haggard, that were a staple of Victorian Britain"; perhaps more significantly, it was a spy novel that "established a formula that included a mass of verifiable detail, which gave authenticity to the story ? the same ploy that would be used so well by John Buchan, Ian Fleming, John le Carré and many others." Ken Follett called it "the first modern thriller."