By Laura Ruby. This is the sequel to The Wall and the Wing, which I reviewed a long time ago.
In the city where everybody (well, almost) can fly due to an accident with a silver pen... the pen has fallen into the hands of grows, who like shiny things, and someone sinister is out to get it. Vampires, an octopus, a giant sloth who likes M&Ms, and a book of badly written greeting card poems all have something to do with what's going on...
Filled with a hilarious and zany sense of humor, this book is full of many fun things, including pop culture references like Amazon (Gurl's, sorry, Georgette's cat Noodle lkes to shop there) and Harry Potter. This is not exactly a big surprise since the previous book introduced a plastic hand with all the answers that the notorious Professor ordered off of eBay. If you like silly but highly entertaining young adult books ("Remember that wireless telephone you invented as a child? What happened to it?" "Uh... I think I dropped it..." "Exactly! And someone else found it, picked it up, and now everyone has one!"), you should like this and its precursor, The Wall and the Wing.
Actually... the spine says this is a juvenile. I suppose it depends on which library you go to.