After attempting to set a mailbox on fire, Pimpette, 14, and her elder sister, Joséphine, spend their summer holidays shuttling between their secretly pregnant mom and bachelor father. But when Joséphine gets involved with the wrong crowd, little Pimpette turns out to be more responsible than the grown-ups who spend their time educating her.

以前过年的时候，怕过年车多人多，坐车麻烦，就提前几天买好了火车票，把行李衣服什么的先寄回了家。今天一吃完早餐就往火车站赶，刚到火车站门口，老妈来电话了：儿啊，你火车票都到家了，你怎么还没到呀？