In the flamboyant twenties, Englishman William Grover-Williams and Frenchman Robert Benoist are fierce rivals racing their elegant Bugattis on the glittering European race circuits. Not only is the World Championship in their sights, but they have both fallen for the sensuous charms of the extravagantly beautiful Eve Aubicq. But when war breaks out, both are signed up by Special Operations Executive for missions behind enemy lines in France, one of which includes investigating rumours of the manufacture of the lethal gas Zyklon B and how it is being used by the Germans. In a series of daring sabotages and assassinations, they cause havoc to the Germans, but finally their cover is blown and they are captured and tortured. Based on a true story of British covert activity and the French resistance during the second world war, this is a gripping novel of heroism, self-sacrifice, love and betrayal.