Book 1

Her name’s Moxie. Moxie McCoy.

Bold, opinionated, and haplessly self-confident, the world’s greatest fourth-grade detective faces her biggest challenge! When someone kidnaps beloved school mascot Eddie the Owl, Moxie is on the case—but she’s forced to fly solo now that her best friend (and crime-solving partner) has moved away.

Moxie must interview her classmates—both as potential new best friends and as possible suspects. Enter Moxie’s little brother, Milton. Quiet, cautious, and boring as a butter knife, he’s a good listener.

Can the Real McCoys form an unlikely alliance and solve the crime of the century?

Book 2

When a baffling mystery strikes Tiddlywhump Elementary, sibling detectives and absolute opposites Moxie and Milton McCoy are on the case. She's the doer. He's the thinker. She's the heart. He's her heartburn.

Milton and Moxie are the perfect problem-solving team...if only they could get along. When their partnership falls apart, Moxie races to identify the mysterious Squiggler first—while learning the hard way that two McCoys really are better than one.

Book 3

Moxie joins the Wonder Scouts to investigate a suspected saboteur in the badge competition. She’s never liked the Wonder Scouts, but once she joins the group, Moxie becomes enchanted with earning badges herself!

Meanwhile, someone has broken into Tiddlywhump’s Local House of History, and it’s up to Moxie’s little brother, Milton, to begin his own investigation.

Can this irrepressible detective duo crack two different cases?