David Bliss grew up hearing stories about his great-aunt Bertha, a once-energetic woman who ran her own shop in the small German town of Husen. But he knew very little else about her until he found a high school in Husen, which for decades has had students research the lives of Holocaust victims. Bliss’ journey to memorialize his great aunt unearthed debates about such memorials in Germany, including those over the “Stolperstein,” or “Stumbling Stone” project. Rebecca Rosman traveled to Husen and Munich to tell this story.