Things Not Seen by Andrew Clements

Things Not Seen is a 2001 science fiction book written by Andrew Clements in which a teenage boy, Bobby, suddenly turns invisible. The story revolves around Bobby as he deals with his 'condition', meets new people, and tries to get back to normal. The book was originally released in 2002 by Philomel Books, but was re-released in 2006 as a platinum edition by Puffin. The platinum edition includes a short interview with Andrew Clements and a redesigned cover.

Now in paperback--the ALA Best Book for Young Adults from the bestselling author of "Frindle." Fifteen-year-old Bobby is used to feeling like he's invisible. Then one morning he wakes up and he "is" invisible. Now he wonders if he'll ever reappear.