An elderly doctor (Catherine Samie) in a Ukrainian town overrun by the Nazis writes “The Last Letter” to her son in documentarian Frederick Wiseman's dramatization of an excerpt from novelist Vasily Grossman's memoir (produced in French with English subtitles). The old woman knows that the Nazis will soon kill her, and this is her last testament. Following the film: the Holocast-related shorts “Zyklon Portrait” and “The Walnut Tree,” by Canadian filmmaker Elida Schogt