Upon a Wheel of Fire by Paul Grieve
Yves Beauchamp is an English army officer who has survived the Great War. Awarded the MC he finds himself back in England, appointed a King's Messenger, a driver delivering intelligence between the embassies of Paris, Berlin and London. And when his intelligence of a plot against Hitler is cynically ignored he discovers that the deceptions of 1919 have become the fatal delusions of 1938 ...At the end of his long and turbulent life, Yves finds a confidant who is drawn into his extraordinary story and, once again, he is compelled to intervene as another avoidable tragedy comes to light.