Book Series · 7 Books

Explorer Academy Books

In order from The Nebula Secret to The Forbidden Island.

The Nebula Secret
The Falcon's Feather
The Double Helix
The Star Dunes
The Tiger's Nest
Where the story begins

First Book in the Series

The Nebula Secret
Sale price
$958
Book #1 · Chapter Book · Ages 9–12 · 2018

The Nebula Secret

By Trudi Trueit

A young explorer uncovers a family secret that threatens his future at an elite academy.

216 pages· 52,975 words· Est. 6 hour read
5.8/7 Bookroo experts
$9.99Save 4%
Summary: Twelve-year-old Cruz Coronado leaves Hawaii for the prestigious Explorer Academy, joining kids from around the world to train as future explorers. But Cruz's journey takes a perilous turn when he discovers his family's mysterious ties to the academy, putting his future at risk. Amidst thrilling classes and augmented-reality adventures, Cruz must unravel the enigma of who is targeting him and why. With puzzles and codes to solve, Cruz's quest for answers becomes a race against time. Can he uncover the truth before it's too late?
In reading order

Explorer Academy Series

7 books · Published 2018–2022

#1
The Nebula Secret
Sale price
$958

The Nebula Secret

Chapter Book · Ages 9–12 · 2018

A young explorer uncovers a family secret that threatens his future at an elite academy.

#2
The Falcon's Feather
Sale price
$958

The Falcon's Feather

Chapter Book · Ages 8–12 · 2019

A young explorer's quest for answers leads to danger and mystery in icy waters.

#3
The Double Helix
Sale price
$958

The Double Helix

Chapter Book · Ages 8–12 · 2019

Cruz races against time to solve a mystery before his 13th birthday changes everything.

#4
The Star Dunes
Sale price
$958

The Star Dunes

Chapter Book · Ages 9–12 · 2020

Cruz faces danger and secrets in Africa, risking everything for answers and a glimpse into his future.

#5
The Tiger's Nest
Sale price
$958

The Tiger's Nest

Chapter Book · Ages 8–12 · 2021

Cruz faces a deadly foe and a life-altering secret on a perilous mission.

#6
The Dragon's Blood
Sale price
$958

The Dragon's Blood

Chapter Book · Ages 8–12 · 2021

A secret threatens Cruz's quest for the cipher's final piece in a life-or-death race.

#7
The Forbidden Island
Sale price
$958

The Forbidden Island

Chapter Book · Ages 8–12 · 2022

Cruz races against time to unlock a life-altering secret amidst global dangers.

Good to know

Common Questions

How many books are in the Explorer Academy series?

There are 7 books in the Explorer Academy series. It began with The Nebula Secret in 2018, and the newest book, The Forbidden Island, was published in 2022.

What order should you read the Explorer Academy books in?

Start with The Nebula Secret and follow the series order — the books above are numbered #1 through #7.

What ages are the Explorer Academy books best for?

The series is best for ages 8–12, based on the age ranges of the individual books.

Which Explorer Academy book is the longest?

The Forbidden Island is the longest book in the series at 63,708 words (256 pages).

Which Explorer Academy book is the shortest?

The Tiger's Nest is the shortest at 52,403 words (216 pages).

The people

The Creative Behind the Books

The authors and illustrators who bring Explorer Academy to life.

01

Trudi Trueit

Author

Keep exploring

Similar Series

The Book of Three

The Chronicles of Prydain

Ages 10–13
Island of the Blue Dolphins

Island of the Blue Dolphins

Ages 10–13
The Ruins of Gorlan

Ranger's Apprentice

Ages 10–15
The Lightning Thief

Percy Jackson and the Olympians

Ages 9–12
Keeper of the Lost Cities

Keeper of the Lost Cities

Ages 8–12
Grounded

Tyme

Ages 8–12
Tuesdays at the Castle

Tuesdays at the Castle

Ages 8–12
Small Spaces

Small Spaces

Ages 9–12

Bookroo

  • About Us
  • Blog
  • FAQs
  • Help Center
  • Contact Us
  • Affiliates

Book Clubs

Book Store

Schools

Book Platform

Authors & Illustrators

Follow Bookroo

© 2026 Bookroo
Terms of ServicePrivacy Policy