Your child tore through every Captain Underpants book and wants more of exactly that: superheroes, silliness, and a grown-up in on the joke. This trail keeps the gleeful chaos going. It starts with the surest comic bets and builds toward chapter books that are just as funny, so the laughing never has to stop while the reading gets bigger, almost without them noticing.
Captain Underpants works because of four things: it's a comic, it's silly, a grown-up leads a double life, and pranks rule the world. Every book here keeps at least two of those running. The trail starts in full comics, then eases toward chapter books that hold the same humor, so the format grows up a little while the laughs stay exactly the same size.