When Glenn Kurtz stumbles upon an old family film in his parents’ closet in Florida, he has no inkling of its historical significance or of the impact it will have on his life. The film, shot long ago by his grandfather on a sightseeing trip to Europe, includes shaky footage of Paris and the Swiss Alps, with someone inevitably waving at the camera. Astonishingly, David Kurtz also captured on color 16mm film the only known moving images of the thriving, predominantly Jewish town of Nasielsk, Poland, shortly before the community’s destruction.