Worm and Caterpillar are best friends. Worm thinks they are alike, but Caterpillar keeps trying to tell Worm that they are different. One day Caterpillar suddenly changes. Worm sticks by Caterpillar while it changes, but wonders if they can still be friends.

This is a Ready to Read Graphics and explains how to read a graphic novel at the beginning of the book. Worm and Caterpillar explain speech bubbles, thought bubbles, panels and what direction and order to read the text. For younger readers who want to read graphic novels, these would be a good introduction. The beginning does have the feel of a picture book because after explaining about panels, the first four pages of text are two page panel spreads and readers do not get to multiple panels on the page until the 6th page.

The life cycle of a worm and a butterfly are included at the end. The author also has included steps for how to draw a worm and how to draw a butterfly on the last page.