Geoffrey Household 
Watcher in the Shadows [EPUB ebook] 

A deadly pursuit through the English countryside from the acclaimed author of ROGUE MALE.After working as a double agent for the British in Nazi Germany during the war, Charles Dennim is now living a quiet, unassuming life in England. Until the postman delivers a letter bomb to his front door.Suddenly hunted by a killer with no name and no apparent motive, Dennim must use his wartime skills to stay alive, and the two master hunters embark on a deadly game of cat and mouse through the picturesque English countryside. With brilliant descriptions of the Cotswolds and a high-stakes manhunt, this is a pursuit novel that stands with Household’s best.