When the Nazis invaded the tiny constitutional monarchy of Luxembourg in 1940, its glamorous head of state, the Grand Duchess Charlotte, fled to London; her husband and children continued on to America, but she stayed behind to broadcast anti-Nazi propaganda to her beleaguered subjects. Made for Luxembourgian TV from conventional materials (stills, newsreel footage, home movies, gray-haired talking heads, gauzily shot dramatizations), this workmanlike doc is a tad too parochial for successful export. Occupied Luxembourgers must have taken comfort from Charlotte’s broadcasts, but writer-director Ray Tostevin stresses her nobility and heroism so heavily that his story gets old fast. If there’s human drama here, it awaits another filmmaker. 98 min.