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Milan Cieslar directs this war drama based on an actual Nazi project to groom young Aryan women for breeding. Soon after the Sudetenland is ceded to Germany, Gretka aces a "biological race examination" and is sent to the idyllic Isolde Spa. There, she along with fresh-faced lasses endure a strict social and physical training routine, though the reason behind the regimen does not become clear until a band of lecherous S.S. officers show up.