Nathalie: Escape from Hell (1978)

In a luxurious château frequented by German officers for leisure, a Russian doctor finds herself imprisoned and in a relentless battle against captivity and a cruel female warden. Meanwhile, an American doctor, confined in a Nazi concentration camp, employs her expertise to rescue an SS officer's life, sparking an unexpected romance. But a ruthless officer, viewing her as his possession, brutally wields a whip to torment her and fellow detainees.