Quickie Postcard Rec #3: guilty pleasures

We love children's literature and all those books that are destined to be classics. But aren't there less...weighty books that keep you up at night, too?

You are invited to send a postcard to your partner listing a few of your favorite children's/YA guilty pleasures. Please list at least 2 - 3 books or series and describe what made them so compelling to you. This subject is open to interpretation, so if you feel it's a guilty pleasure, we'll call it a guilty pleasure! Generally speaking, though, think books that have no chance at all of being nominated for a Newbery Medal. ;)

Postcards should be sent naked and stamped, are sender's choice, do not specifically need to fit the written theme, and can be store-bought, handmade, clean-thrifted, or vintage. (But please--do try to send something nice.) You will send 2 postcards with recommendations and receive two cards in return, perhaps with ideas for new books to read or favorites to re-visit!