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My daughter was gifted the first book of the series by friends and that had her hooked. Got her this one for her birthday and she spent couple of hours reading and finishing it without a break! I loved the concept in the book series of throwing in challenges for the little minds to solve. The request for the third book is already on!!!
My 11 yo son loves this series. He’s read the other one and loved it as well. Full of adventures, suspense & some humor. There are always bonus clues and activity at the end. He finished in a week (1hr daily reading) Highly recommended. Now I have to buy the other ones.