This book is one of my personal favourites, even among the works of Jack Higgins.
The discovery of old photographs of British war hero Harry Martineau dressed in a Nazi uniform serves as the starting point for this fast-paced historical thriller. Set on the Channel Islands during the Second World War, "Night of the Fox" revolves around Martineau's assembly of a team of doppelgangers who, posing as an elite German squad, are sent to retrieve a captured British officer - a man who knows the exact time and place of the Allied invasion of France. Things fall apart when one of Martineau's men drowns and is discovered to be wearing a R.A.F. uniform under his German one. Higgins skilfully keeps the story moving forward, and the remembered tale of heroism and sacrifice is told with just a hint of nostalgia, in a tone appropriate to the sad chain of events its heroes endure.