Extract the answer to the following question from the movie plot. If the question isn't answerable, please output "Can't answer". Question: Who tortures Ellis? Title: Black Book Movie plot: In 1944, Rachel Stein, a Dutch-Jewish singer who had lived in Berlin before the war, is hiding from the Nazi regime in the occupied Netherlands. When the farmhouse where she had been hiding is accidentally destroyed by an American bomber, Rachel manages to escape the area thanks to a local man, Rob, and visits a lawyer named Smaal, who provides her with some of her father's money so that she can flee, helped by a man named Van Gein. Rachel and Rob are reunited with her family and try to flee by boat through the Biesbosch with other Jews from the Nazi-occupied part of the Netherlands to the liberated southern part of the country. However, it turns out to be a trap. They are ambushed on the river by members of the German SS, who kill them and rob the bodies of their cash and other valuables. Rachel alone survives, but she does not manage to escape from occupied territory. Using a non-Jewish alias, Ellis de Vries, Rachel becomes involved with a Dutch resistance group in the Hague, under the leadership of Gerben Kuipers and working closely with a doctor in the Resistance, Hans Akkermans. Smaal is in touch with this Resistance cell. When Kuipers' son and other members of the Resistance are captured, Ellis agrees to help by seducing local SD commander Hauptsturmfuhrer Ludwig Muntze, bleaching all of her hair blonde. Muntze invites her to a party at the local SD headquarters, and there, Ellis recognises Obersturmfuhrer Gunther Franken, Muntze's brutal deputy, as the SS officer who oversaw the massacre of her refugee party. She obtains a job as a secretary at the SD headquarters while also falling in love with Muntze, who, in contrast to Franken, is not abusive or sadistic. He realises that her hair is bleached and she is a Jew, but does not care. She also becomes friends with her Dutch colleague Ronnie, who collaborates with the Germans, working for them, being sexually available to them (particularly Franken), and accepting stolen gifts from them. Thanks to a hidden microphone which Ellis plants in Franken's...
The answer to this question is:
Anti-Nazi volunteer jailers