Merlin is the extraordinary story of the development of the Rolls-Royce engine that would stop Hitler from invading Britain and carry the war to the very heart of Germany. The story of the Merlin engine encompasses the history of powered flight, from the ingenuity of the Wright Brothers to the horrors of World War I, and from the first crossing of the Atlantic to the heady days of flying in the 1920s. There is also the extraordinary story of the Schneider Trophy—an international contest wherein nations poised on the precipice of war competed for engineering excellence in the name of progress. And at the heart of this story are the glamourous lives of the pilots, many of whom died in their pursuit of speed; the engineers, like Henry Royce of Rolls-Royce, who sketched the engine that would win WWII in the sand of his local beach; and perhaps most importantly the Lady Lucy Houston who singlehandedly funded the development of the engine and the iconic Spitfire.