Doreen Cronin & Harry Bliss Paperback Series: I Can Read Level 1 JUVENILE FICTION/Readers / Beginner Worm is thrilled when it’s his turn to take care of the class pet, Nat the Gnat. But everything goes wrong when he leaves the lid of Nat’s tank open. Can Worm make sure the class pet returns safely before Mrs. Mulch finds out? Diary of a Worm: Nat the Gnat captures the fun of the #1 New York Times bestselling series by Doreen Cronin and Harry Bliss and leaves readers wiggling for more in this brand-new, original story, perfect for beginning readers.