For the first time in her pampered life, the headstrong American, Constance Vivier-Clarke, has been pressed into doing something useful for a change. Driving an ambulance for the American Hospital in Paris, "Viv" is caught in the crossfire when the Nazis march into Paris. She makes a harrowing getaway over the Pyrenees into neutral Spain and on to London in hopes of finding a role to play in the fight against fascism. The mysterious Marcel Delonge, a deputy to General de Gaulle, touts Viv's successful clandestine escape to British Intelligence, emphasizing her notoriety as a daredevil skier. The "washout" Olympic hopeful is enlisted as a secret agent and courier-on-skis, ferrying messages and weapons to the Resistance in the enemy-infested French Alps. Jean-Paul Morand, a young physician, is desperate for someone to guide the downed pilots and Jewish orphans he's hiding in his alpine infirmary to safety in Switzerland. But a question lingers: Is this former playgirl up to the task, or will Viv get herself and her comrades killed--especially when this unlikely member of "Churchill's Angels" flaunts the most important rule of all and falls in love with a fellow spy and saboteur? With rumors rife of an Allied invasion, someone has betrayed Viv's Mountaineer intelligence network, but who?