The Mostly Invisible Boy, Casey Grimes #1 (eBook)
An invisible kid. A secret monster-hunting school. A book series families can't stop reading.
📘 Book 1 of the Casey Grimes middle grade fantasy action adventure series.
Being invisible sounds cool…until no one saves you a seat at lunch.
Casey Grimes isn’t just ignored. He’s actually invisible.
Kids walk into him. Teachers forget he exists.
It'd almost be a joke—if it wasn’t his actual life.
Everything changes when Casey climbs a giant oak tree after another humiliating day—and discovers a hidden fortress, a monster-haunted wilderness, and kids who treat battling beasts like gym class.
Suddenly, he's no longer the weird invisible kid—he's a kid who might accidentally die.
Because this isn't some cozy magical academy. This is a secret monster-hunting school. And America's backyards are the battleground.
Good news? Casey’s tough, funny, and hard to kill.
Bad news? Everyone else is, too.
And his fearless little sister, Gloria, insists on tagging along. Together, they’re thrown into a world of mythical creature attacks, suspicious teachers, fast-paced mystery and forgotten magic. Also...no bathroom breaks.
The monsters are real. The training is deadly. And Casey Grimes is in way over his head.
Why Readers Love This Book
⭐️⭐️⭐️⭐️⭐️
“Delivered the whole set to my grandson Tuesday. He was too immersed in reading to even look up from the book to say goodbye when I left!”
— Grandparent reviewer
- Moves fast without being overwhelming
- Smart humor paired with real stakes
- Clean, age-appropriate adventure parents trust
- Short chapters that keep kids reading
“Fast-moving and exuberant, packed with imagination.”
— Kirkus Reviews
Beloved as a read-aloud and devoured solo, The Mostly Invisible Boy brings families together around a story that’s exciting, funny, and impossible to put down.
Book one is only the beginning.
Suit up.
Climb the tree.
Face the monsters.
👉 Start the Casey Grimes adventure here.