Like thousands of Jewish communities throughout Europe, the town of Wolbrom in Poland was a complete world, flourishing with creativity and culture, religion and tradition, social life and politics. During a twenty-four hour period in September 1942, this small, yet thriving Jewish community was destroyed. On One Clear Day offers a glimpse into the world that was Wolbrom before the war, its fate, and subsequent efforts to remember and to commemorate the community and those who perished.