Flight of Eagles - Jack Higgins

It is the early days of World War II, and two brothers find themselves on opposite sides. Max and Harry Kelso were born in the U.S. of a German mother and an American father. They were separated as boys when their mother took Max back with her to Germany, and now Max has grown up to become a feared pilot with the Luftwaffe, and Harry a Yank ace in the RAF.

Each has kept track of the other's progress, but neither could possibly predict the extraordinary circumstances under which they are about to meet again. Forces much greater than they have set in motion an intrigue so devious, so filled with peril, that it will require that they question everything they know, all that they hold most dear -- their lives, their families, their loyalties. Upon the results of their actions will hang, unalterably, the course of the war itself....