Hi Sammie,
I own this book, but have never taken the 5 minutes to read it. It's a children's biographical book about Jim Henson's upbringing and rise in show biz. I'd say it was probably written for a fifth or sixth grade audience. It has some interesting illustrations in it, all based on photographs we've seen elsewhere. One of the more interesting ones is a variation on the famous photo of Jim in silhouette holding up Bert... this is instead Bert holding up a puppet of Jim.
Like I said, I haven't taken the very short amount of time that it would take to read it yet (not sure why), but I have skimmed through it and it contains some key information that for the most part can be found elsewhere without the dramatic spin that the author provides here.