Watch VoirFilms. The incredible true story of Ernst Cahn, a beloved Jewish ice cream parlor owner who in 1941 was targeted, arrested, and tortured by the infamous "Butcher of Lyon" Klaus Barbie. The choices Cahn made sparked a series of events that led to over 300,000 Dutch citizens going on strike and shutting down Amsterdam for three days, in what became the largest anti-Nazi protest in history.