Lewis's own most recent book, published in 2011, is a military biography "Racing Ace – The Fights and Flights of "Kink" Kinkead DSO DSC* DFC*", published in 2011, recounting the adventurous life of a pioneering airman whose grave he found in his constituency. In choosing it as a 'Book of the Year 2011' for "The Sunday Telegraph Magazine", historian Andrew Roberts described Samuel Kinkead as "one of the bravest airmen of the 20th century", and "Racing Ace" as "exactly what an action biography should be".