Flight of Eagles — Jack Higgins

In the early days of World War II, nations were forced to choose sides in the epic battle that would change history forever. But for two brothers, fate had already made the choice. Separated as boys, Max and Harry Kelso have grown up to become ace fighter pilots--Max with the German Luftwaffe and Harry in Britain's RAF. Now, the machinery of war has set in motion an intrigue so devious, so filled with peril, that it will require them to question everything they know, everything they hold most dear: their lives, their families, their loyalties. Against impossible odds, it is their courage alone that will decide the course of the war...