Follows a pair of siblings who love but distrust each other as they embark on a white-water rafting trip with a small group. One of their friends from childhood turns out to be more dangerous than he appears.。1997年夏,一位八岁男孩天天目睹外婆的自行车被盗。面对大人们的无可奈何,忿忿不平的他决心以一己之力伸张正义。一场大胆的擒贼计划,让祖孙三代暗潮汹涌的秘密逐渐浮出水面。。