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"The Riddle of the Sands: A Record of Secret Service" is a novel by Erskine Childers, published in 1903. The novel is set in the period before World War I and tells the story of two young Englishmen who decide to sail a small boat from England to explore the Frisian Islands off the coast of Germany. While there, they discover a secret German naval base and embark on a dangerous mission to gather information that could help prevent a possible attack on England.

The novel is considered to be one of the earliest examples of the modern spy thriller genre. It is known for its detailed descriptions of sailing and navigation, as well as its depiction of the tensions between Britain and Germany in the pre-World War I era. The novel was also controversial at the time of its release because it provided valuable information about British naval defenses to potential enemies.

"The Riddle of the Sands" has been adapted into several films, radio plays, and TV series over the years, and is considered a classic of espionage literature.