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Nine-year old enjoys this series. He likes the characters. The books prompt some discussions of a variety of content because the settings vary widely. This one has a ghost, hotel, dumbwaiter, actors and attempted unethical business deal. It's a decent read. In the A to Z series, I prefer The Invisible Island, The Mayflower Treasure Hunt, and the The Sleepy Hollow Sleepover. Oh, and the one about the mummies. The Haunted Hotel is good, but I like some of the others better because the kids get into more dangerous predicaments.
My son loves these books. Great read for him. He's 8. It holds his attention. He reads it from cover to cover at one time. As a parent it's great to have a child that loves to read. I would recommend this book.
My first grader and I are reading this together. There's a lot of difficult words in it that he can't quite read yet so I definitely have to help him with it however it's pretty simply written and he likes zombies!
My second grade son started reading this series of books when he made the move to chapter books. They are not as difficult as Hardy Boys and are a very fun easy read. There are a few illustrations sprinkled throughout the book which my son really enjoys.
I would consider a set if you are going to buy these as a gift.