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From Yakaboo:

This book is the perfect learning tool for those who want to test and improve their English language skills. The publication includes a fascinating detective story, which will significantly expand the boundaries of your English vocabulary, while giving you the true pleasure of reading the exciting adventures of Scotland Yard police inspector James Hudson, who is talented in investigating the most intricate crimes. The detective story is complemented by crosswords and various exercises to help you test your English language skills. The book is intended for English language learners and detective fans.