In the early 1920s amidst the upheaval of Weimar Germany, a small group of peaceable idealists began to meet, practicing a quiet, communal life focused on self-improvement. For the most part, they had come to know each other while attending adult education classes in the city of Essen. But "the Bund", as they called their group, had lofty aspirations - under the direction of their leader Artur Jacobs, its members hoped to forge an ideal community that would serve as a model for society at large. But with the ascent of the Nazis, the Bund was forced to re-evaluate its mission, focusing instead on offering assistance to the persecuted, despite the great risk. Their activities ranged from visiting devastated Jewish families after Kristallnacht, to sending illicit letters and parcels of food and clothes to deportees in concentration camps, to sheltering political dissidents and Jews on the run.

What became of this group? And how should its deeds - often small, seemingly insignificant acts of kindness and assistance - be evaluated in the broader history of life under the Nazis? Drawing on a striking set of previously unpublished letters, diaries, Gestapo reports, other documents, and his own interviews with survivors, historian Mark Roseman shows how and why the Bund undertook its dangerous work.