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From Yakaboo:

If you don't like learning English with ordinary textbooks, this book is for you. This is not an ordinary textbook, but a whole novel written with humour and in a light way. Together with Inspector Hudson, you will solve mysteries and conduct detective investigations, not forgetting about learning a foreign language. The book contains 100 exercises. These will help you to consolidate the material you have learnt and test your knowledge with the help of tests. You will find keys and explanations to the tests and exercises in the book.