✨ First in an Exciting New Series

Henry Hail and the Whittier Kids

Mystery of the Lost Locker

A secret locker. A hidden society. A mystery buried for over a century. When Henry Hail and his friends stumble upon a long-lost locker during school renovations, they uncover cryptic letters, a rusted key, and clues pointing to a 1907 train robbery—and a secret society determined to hide the truth.

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Henry Hail and the Whittier Kids book cover

An Adventure Awaits

Perfect for fans of The Mysterious Benedict Society, Encyclopedia Brown, and anyone who's ever believed their school might be hiding secrets.

Meet the Whittier Kids

Four friends with unique talents who work together to solve the mystery of a lifetime

Henry Hail

Henry Hail

The observant leader with an exceptional memory and talent for spotting patterns and details others miss. When mystery calls, Henry reluctantly steps up to guide his friends.

"We need to be systematic about this," Henry insisted, consulting a color-coded checklist he'd created.
Eleanor

Eleanor

The confident strategist and adventurer who's quick to take action when others might hesitate. Her bold thinking keeps the team moving forward.

She shrugged. "Tell that to my eyes, Henry. They don't lie."
Nate

Nate

The tech-savvy researcher with a knack for uncovering hidden connections. His gadgets and analytical skills help solve the toughest puzzles.

"If it's a locker, the dimensions are off by about two inches for the standard models used at the turn of the century," said Nate.
Zach

Zach

The creative thinker whose humor lightens tense moments while his quick thinking and improvisational skills get the team out of tight spots.

"If there is a portal in there, dibs on using it to skip Miss Penwell's class."
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Why You'll Love This Adventure

A fast-paced mystery packed with humor, teamwork, and real Oklahoma history

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Mystery & Suspense

A century-old secret, hidden tunnels, and rival classmates create the perfect mystery adventure that will keep readers guessing until the very end.

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Puzzles & Codes

Cryptic letters, old maps, and thrilling discoveries engage curious minds and problem solvers with hands-on mystery elements.

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Real Oklahoma History

Authentic local history and landmarks make learning come alive through adventure, connecting the 1907 train robbery to modern-day discoveries.

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Friendship & Teamwork

Four unique characters with different strengths show how teamwork, loyalty, and friendship can overcome any challenge.

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Humor & Heart

Laugh-out-loud moments and genuine emotion balance the suspense, making this perfect for family read-alouds and independent readers.

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Series Starter

The first in an exciting new series, with the exciting follow up coming in 2026 for continued adventures.

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Get a Taste of the Adventure

Experience the mystery, humor, and excitement that awaits in every chapter

"Open Sesame," Zach said, and the locker creaked open. What they saw next surprised them all.

—The moment everything changes

Zach unzipped the main compartment, and an avalanche of snack packages spilled onto the floor—beef jerky, trail mix, candy bars, three different kinds of chips, and what appeared to be an entire box of granola bars. "We might get hungry," he said defensively. "Are we exploring a cave or setting up a convenience store?" Eleanor asked.

—Chapter 18, "Gear Up for Adventure"

"Coming!" Henry replied, his mind already racing ahead to their next adventure. The wrong bridge had led them to the right path, and tomorrow, they would uncover the truth hidden for over a century.

—Setting the scene for adventure

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Dave Hail III, Author

Dave Hail III

Author & Creative Strategist

Debut novel author and Oklahoma native, David Hail is a writer, creative strategist, husband, and father of two. Inspired by history, mysteries, and kids' imaginations, he blends two decades of nonprofit storytelling into his first middle-grade series. Henry Hail and the Whittier Kids celebrates friendship, courage, and curiosity. When he's not writing, Dave helps organizations tell stories and enjoys family adventures and sports.

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What Readers Are Saying

"My 10-year-old couldn't put it down — we can't wait for the next book!"

— Early Reader

"A perfect blend of humor, history, and adventure — an instant favorite in our family."

— Parent Review