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Kvyatkovsky is a real detective who loves milk and Carpenter's chewing gum. Instead of homework, he has night ambushes, and instead of children's entertainment, he has dangerous adventures. Even the most intricate crime is doomed to failure if this young detective is involved. This time, the theft took place in a detective museum: a valuable exhibit, an original Sherlock Holmes pipe, was stolen. It is a great honour for Kvyatkovsky to take on this investigation. But the case turns out to have a double bottom.