内容简介：

作文成绩公布，平时表现不特出的静宁竟然得了第一！

聪铭不甘心，认为静宁有“秘密武器”才会打败他。他和“死党”慧洁、大伟决定查个水落石出。

三人开始密切留意静宁的动静，以便找出静宁的“秘密武器”。就在三人毫无收获，快要放弃的时候，聪铭偶然看见静宁一个人在课室里对着一个小铁盒说话……

小铁盒里究竟装着什么？难道小铁盒就是静宁的“秘密武器”？！

The results of the essei-writing competition were out! The dark horse, Jing Ning, emerged the winner!

Cong Ming was unhappy over it. He felt that Jing Ning must have a ‘secret weapon’ to beat him. So, he and his ‘gang’, Hui Jie and Da Wei, decided to do their own investigation to find out the truth.

The three of them started to secretly take note of Jing Ning’s every move to get to her ‘secret weapon’. Just as they were about to give up, Cong Ming happened to witness Jing Ning, alone in class, and talking to a small metal box...
What is in the small metal box?

Could this small metal box be her ‘secret weapon’?