When Cassy the clumsy crocodile gets a job at Everglades Department Store, she certainly makes things happen - but not in the way she hopes. Toys, food, china... she leaves a trail of destruction behind her in every department she visits. But in the end, Cassy's clumsiness saves the day and turns her into a hero.

USBORNE图书馆系列到LEVEL6之后，词汇量增加到2000-2500，每页的文字数量在十行左右，共64页，涵盖了英文大部分的语态和时态。从这个级别开始，已正式进入到章节阅读。适合七八年级作为词汇量扩展读本。Level6系列均为世界知名的民间故事和童话故事以及传记，学生一般都已接触过中文版本。