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From Yakaboo:

Tired of struggling with an English textbook? Would you rather read a good detective story instead of grammar exercises? This book will help you combine business with pleasure. This wonderful, exciting, action-packed detective story about the adventures of Inspector Hudson in English will help you learn new words and expressions while having fun and test your English language skills. In addition, the book contains crosswords and exercises that will help you solve the detective case and practise your grammar. Have fun and enjoy learning.