Book excerpt: The Lisbon Route tells of the extraordinary World War II transformation of Portugal's tranquil port city into the great escape hatch of Nazi Europe. Royalty, celebrities, diplomats, fleeing troops, and ordinary citizens desperately slogged their way across France and Spain to reach the neutral nation. As well as offering freedom from war, Lisbon provided spies, smugglers, relief workers, military figures, and adventurers with an avenue into the conflict and its opportunities. Yet an ever-present shadow behind the gaiety was the fragile nature of Portuguese neutrality.