The older sister has endured years of blame and neglect while her beautiful, clever younger sibling enjoys all the family's affection. Tired of the injustice, she carefully executes a dangerous summer plan at the chaotic train station, leaving the little girl alone amid warnings of kidnappers. When the child vanishes, parents collapse in grief and accusations fly, yet a kind policewoman shields the 'innocent' girl from blame. Years of hidden resentment surface in one irreversible act. Can perfect innocence ever truly be lost?