No Escape (2008)

Two Eastern European communist girls (perhaps sisters) have stolen some emeralds from the Nazis during WWII and are on the run. One gets captured by a lesbian Nazi woman and tortured into revealing the location of the gems. The other escapes to her cousin's house, but her cousin turns out to be pretty messed up and blackmails the girl into becoming her personal slave in return for not turning her over to the Gestapo.