Stink: Superhero Superfan - Megan McDonald - Bog

"At a Moody family yard sale, Stink uncovers a box of old comics about a superhero he's never heard of: Super Gecko. What could be more fantastic than a part-man, part-lizard with superpowers? Hello, fun! Even better, Super Gecko just happens to be making a super comeback. And just as Stink becomes Super Gecko's number one fan, the impossible happens: Stink starts receiving mysterious notes signed by Super Gecko himself. But Super Gecko isn't real, is he? Using his newly acquired superpowers of science and deduction--all the cool stuff he's learning at Saturday Science Club--Stink puts himself to the test. Can he figure out who is writing the letters?"--