Director Pablo Trapero scored a home run with the first of two Argentine films in competition at the Cannes Film Festival this year. “Leonera” (Lion’s Den) put a believable, complex character into harrowing circumstances and made sure that the audience stayed on her side. The film opens with a blood-spattered Julia waking up in an apartment that has become a crime scene. Soon thereafter, she’s hustled off to prison where she eventually gives birth to a son. Is she guilty? We’re not sure. The film’s ambiguity avoids a simplistic “Innocents Behind Bars”  message movie. Her jailhouse life is credible without trying to be a sociological study and her ultimate redemption (through her child, of course) manages to be gently surprising. Tighter editing would have helped the film’s pace which drags at times but the performances are always compelling.