To the French, it felt like the end of the world. 1940: defeated in six weeks, surrender, subjugation, overrun by German soldiers whose power of life or death were absolute and absolutely capricious. Fascism triumphant; organized resistance as yet unimaginable.

Simone de Beauvoir, who dedicated herself to the study of ethics, struggled to adjust to everyday life in Nazi-occupied Paris. On the Metro, a German soldier — Wehrmacht, low-ranking and therefore a conscript? — asked for directions. Seemed like a nice kid. Besides, refusal was dangerous. But he was an invader. What was the right thing to do: a little treasonous help, or send him to some dangerous neighborhood?

On a macro level, the French had to decide to what extent to cooperate with the terrifying new regime.