民国期间，古蜀国藏宝图流落于蓉城洗面桥监狱的传闻甚嚣尘上，引来各方势力觊觎。尤其是洋人们，更是直接向蓉城总督吴将军施压，谋夺藏宝图。 为防宝藏落入洋人手中，蓉城学堂的学生们制定了夺宝计划。学生许家兴伪造罪名，试图混入监狱，暗查藏宝图的下落，不料，却被护弟心切的哥哥许家和顶替入狱。 许家和本有能力越狱逃生，然而得知弟弟的真实目的后，不得已卷入对“藏宝图”的争夺。然而，死囚们的身份各有迷局，狱内外的局势也时时变幻莫测，兄弟二人几经生死，险象环生。 最终，许家兴与许家和里应外合，在其他爱国人士的帮助下，终于成功找到藏宝图，守护了民族财富。

Rumors of a treasure map from the ancient Shu Kingdom hidden in Ximianqiao Prison attract various factions and pressure General Wu, the governor of Chengdu. To protect the treasure, students from a local academy devise a daring plan, with Xu Jiaxing faking a crime to infiltrate the prison. However, his protective older brother, Xu Jiahe, takes his place. As Xu Jiahe discovers his brother’s true intentions, he becomes embroiled in the struggle for the map. Facing perilous challenges and hidden identities, the brothers join forces with fellow patriots to locate the treasure map and safeguard their nation's heritage.