Some folks, seeing as we are all still strapped with the Puritanical Outlook, think that the "invisible nudity" in this story is a bit mature, shall we say, for the young reader. Pshaw! I say. Kids, read on; read books, especially banned books. Of the thousands of books I've read, nothing in thems comes close to the offensive messages shown routinely on TV or in video games...The value of the written word is without a doubt much more valuable to all of us than anything "screens" have to offer. Things Not Seen is an imaginative, positive, wonderful story of a teenage boy faced with a challange few of us will ever see. His response to that situation is admirable, and well worth reading about. Great Book! I wish it were longer!