Entering Grade Four
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HUMOR
The Bad Guys series by Aaron Blabey
Mr. Wolf, Mr. Piranha, Mr. Snake, and Mr. Shark are about to start a campaign to become good guys. Mr. Wolf has a daring plan for their first good guy mission: breaking two hundred dogs out of the Maximum Security City Dog Pound. Will Operation Dog Pound go smoothly? Will the Bad Guys become the Good Guys? And will Mr. Snake please stop swallowing Mr. Piranha?! (graphic novel)
Big Monty series by Matt Maxx
Book 1: Big Monty and the Lunatic Lunch Lady
Fifth-grader Merlin Montgomery, AKA Big Monty, needs to use all his science skills to defeat the monster made of leftover lasagna and fish sticks that the lunch lady has created to attack the ungrateful students.
House of Robots series by James Patterson
Book 1: House of Robots
Sammy Hayes-Rodriguez struggles to fit in to his new fifth-grade class, which becomes difficult when his inventor mother requires him to take her latest creation, a robotic "brother," to school with him to learn to become a student.
Pie in the Sky by Remy Lai
also by this author: Fly on the Wall
When Jingwen, his mother, and his annoying little brother Yanghao move to Australia from China, it sees like they're living on an alien planet. The only thing he looks forward to is working on cake recipes, which is problematic because he has to babysit his bratty brother and isn't allowed to use the oven.
Platypus Police Squad series by Jarrett J. Krosoczka
Book 1: The Frog Who Croaked
Paired together after a veteran detective retires, platypus police squad members Rick Zengo, a hotshot rookie, and Corey O'Malley, a hard-nosed old-timer, struggle with their differences while tackling their first case involving a missing schoolteacher and a duffle bag filled with illegal fish.
The Rhino in Right Field by Stacy DeKeyser
The place Nick and his friends play baseball has one problem. The right field borders the rhinoceros pen at the city zoo, and when you miss a fly ball, you have to hope you're faster than a 2,ooo pound animal named Tank when you have to retrieve it.
Sparks series by Ian Boothby
Book #1: Sparks
August and Charlie want to help save the universe, but as cats, no one trusts them. So, disguised in a mechanical dog suit, they set out to foil the evil alien Princess. (graphic novel)
Stickman Odyssey series by Christopher Ford
Book 1: An Epic Doodle
After Zozimos is banished by an evil witch (his stepmother!) from the kingdom of Sticatha, he travels across stormy seas (thanks for that, Poseidon), slays golems and monsters (with a lot of help), and somehow (despite his lack of hero talent) survives quest after quest. By the love of Zeus, though, none of it brings him any closer to home! (graphic novel)
Timmy Failure series by Stephan Pastis
Book 1: Mistakes Were Made
Eleven-year-old Timmy Failure launches a detective business with a lazy polar bear partner named Total but finds their enterprise, "Total Failure, Inc." challenged by a college-bound spy and a four-foot-tall girl whom Timmy refuses to acknowledge.
The Treehouse Books series by Andy Griffiths
Book 1: The 13-Story Treehouse: Monkey Mayhem!
Kid authors Andy and Terry live in a very large treehouse complete with a bowling alley, a see-through swimming pool, and a secret underground laboratory, They are working on their next book, but distractions including thirteen flying cats, giant bananas, mermaids, and a sea monsters pretending to be mermaids keep getting in their way.
Wedgie & Gizmo series by
Book 1: Wedgie & Gizmo
Wedgie is a happy, eager-to-please Corgi dog.  Gizmo is a sullen, evil genius guinea pig. When their humans move into the same house, Gizmo begins to plot to: a) get out of the pink Barbie house, b) take over the world and c) destroy his archenemy Wedgie.