Entering Grade Four
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HUMOR
Platypus Police Squad: Frog Who Croaked
Jarrett J. Krosoczka
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.  (series)
Timmy Failure : Mistakes Were Made
Stephan Pastis
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.
Waste of Space
Stuart Gibbs
Dash Gibson is on the case when billionaire Lars Sjoburg is poisoned. (series Moon Base Alpha)
Way of the Warrior Kid; From wimpy to Warrior the Navy SEAL Way
Jocko Willink
Marc struggles with a bully at school, but when his uncle comes to stay, they create a plan to build up his confidence. 
The Worst Class Trip Ever
​Dave Barry
When his eighth grade class goes on a trip to Washington, D.C., Wyatt finds himself in trouble on the plane because his best friend, Matt, has decided the men sitting behind them are terrorists and it is up to the boys to stop them.