This book intrigued my kids ages 7-13yrs. Every day we'd read another chapter and they'd get closer to solving the mystery! They looked forward to it and loved finding out more of the adventure. It is a bit of a slow read, for example, rather than solve the mystery of the shoe box, they spend time trying to figure out if the shoe box was placed in the attic or if it just appeared in the attic. This seemed silly until they applied the same idea to how the universe came into being.
I think this would be an awesome read for anyone interested in theories, in schools who don't teach creation or someone who likes to come to conclusions for themselves.
It is set for reading individually but can be read out loud.