Valentina dreams of being a trapeze artist and believes that because she is Down she will not be able to achieve it, but her grandmother assures her that, if the caterpillars manage to turn into butterflies, nothing is impossible.。讲述了抗战末期的东北,抗联部队秘密潜回哈尔滨,准备和苏军里应外合一举击溃日军的最后防线,国民党中统滨江警察局局长派美女特工进行潜伏,密谋夺取哈尔滨的故事。。