The Riddle of the Sands. A Record of Secret Service; Penguin, 2011

Loosely based on the author's own experiences, The Riddle of the Sands takes readers back to the early days of the twentieth century, when Britain shared a tense rivalry with the Kaiser's Germany. Tempted by the idea of duck shooting, Carruthers is lured by his friend Davies into a yachting expedition in the Baltic, only to discover that the itinerary involves more than killing fowl. Soon they're on a wild journey of intrigue, meeting danger at every turn, and ultimately unraveling Germany's secret plans to invade England. Tautly written and full of unexpected twists, this is a timeless work of espionage fiction.