On Max's birthday, he finds a mirror in the attic. But this is no ordinary mirror—this one can make him invisible! So Max and his friends start playing "now you see me, now you don't." It's all fun and games until Max realizes that he's losing control. He's staying invisible a little too long and having a harder and harder time changing back. Turning invisible is turning into a very dangerous game. The next time Max gets invisible, it could be forever!