Twelve-year-old Cruz Coronado leaves his home in Hawaii to study and travel with other young people invited to attend the elite Explorer Academy in Washington, D.C., but a family connection to the organization could jeopardize his future.

Adventure, danger, and a thrilling global mission await 12-year-old Cruz Coronado as he joins an elite school for explorers. Cruz leaves his tranquil home in Hawaii to join 23 talented kids from around the globe to train at the Explorer Academy with the world's leading scientists to become the next generation of great explorers. But for Cruz, there's more at stake. No sooner has he arrived at the Academy than he discovers that his family has a mysterious past with the organization that could jeopardize his future. In the midst of codebreaking and cool classes, new friends and augmented reality expeditions, Cruz must tackle the biggest question of all: Who is out to get him, and why? Readers can get in on the excitement with puzzles and codes embedded throughout.

It's an adventure of a lifetime when Cruz Coronado sets sail for the shores of Iceland and Norway aboard the Explorer Academy ship to continue his studies at sea. But, things take a turn while exploring the icy north, when he embarks on a dangerous mission to uncover the first piece of an important puzzle his mother left behind. In the exciting follow-up to The Nebula Secret in the 7-book Explorer Academy series, Cruz, Sailor, and Emmett, along with their new ally Bryndis, embark on their first globe-trotting mission aboard the ship Orion. Cruz jumps right back into school and starts using the latest technology in submersible underwater dives, but is soon reminded of the dangers of exploration when his equipment fails and he almost drowns. Determined to keep his eyes on the prize, Cruz sneaks away to try to find answers, but unknowingly lures his friends into bigger trouble. When a friend of Cruz's mom meets an untimely end, Cruz's luck really seems about to run out and the questions multiply. What does the message mean? Where will it lead? Who is following him? And why? This captivating book is the sequel every Explorer Academy fan is waiting to read!

An explosive revelation and a familiar face in the sixth book in this adventure-packed series. Still reeling from the life-changing discovery he found buried in the mysterious archive, Cruz Coronado grapples with an important secret as the gang heads to China in search of the second-to-last piece of the cipher. Under the watchful eye of a new adviser, life on the ship returns to almost normal...Almost. Just as things seem to be going smoothly, a familiar face shocks Cruz back into reality, and the final piece in this life-and-death scavenger hunt veers toward a dead end. Explorer Academy features: Gripping fact-based fiction plot that inspires curiosity with new technology and innovations; Amazing inventions and gadgets; A cast of diverse, relatable characters; Secret clues, codes, and ciphers to track down within the text; Vibrant illustrations, Elements of STEAM; National Geographic explorer profiles in The Truth Behind Section. Complete your collection with: The Nebula Secret (1) The Falcon's Feather (2) The Double Helix (3) The Star Dunes (4) The Tiger's Nest (5) Explorer Academy Code-Breaking Adventure Explorer Academy Ultimate Activity Challenge Explorer Academy Field Journal Explorer Academy Future Tech

Sailor York and the daring recruits of Explorer Academy uncover an elusive animal-smuggling ring in the first electrifying book in this new five-book series. Soon after Cruz, Sailor, Emmett, and Lani return for their second year at Explorer Academy, their sense of calm is shattered when Sailor’s older sister goes missing. Amidst incredible expeditions to far-flung destinations and competitive classes, Sailor bravely steps into the lead to discover how her sister’s sudden disappearance may be linked to an illegal and deadly animal-trafficking ring. Despite winning the prestigious North Star Award and being surrounded by close friends and teachers who she has traveled the world with, Sailor’s never felt less sure of herself. As the recruits face puzzling obstacles and try to follow complex clues, Sailor realizes there’s only one thing that could save her sister in time: revealing her own deepest secret.

A heart-pounding final showdown changes the life of Cruz Coronado forever in the seventh and final book in this thrilling fact-based fiction series. Amid assignments that take the Explorer Academy recruits from the iceberg-filled waters of Antarctica to the bone-dry deserts of Argentina, Cruz Coronado is scrambling to complete the last piece of the cipher. With Nebula agents and the elusive explorer spy still out there, his opportunity to recover his mother's world-changing formula is slipping away. But as Cruz has learned from his time aboard Orion, true explorers must never give up. Even after completing dozens of high-risk missions and traveling to all seven continents, Cruz could never prepare himself for one ultimate surprise. Explorer Academy features: Gripping fact-based fiction plot that inspires curiosity with new technology and innovations; amazing inventions and gadgets; a cast of diverse, relatable characters; secret clues, codes, and ciphers to track down within the text; vibrant illustrations; elements of STEAM; National Geographic explorer profiles in the "Truth Behind" section. Complete your collection with: The Nebula Secret (1) The Falcon's Feather (2) The Double Helix (3) The Star Dunes (4) The Tiger's Nest (5) The Dragon's Blood (6) Explorer Academy Codebreaking Activity Adventure Explorer Academy Ultimate Activity Challenge Explorer Academy Field Journal Explorer Academy Future Tech

As Cruz and his friends continue to search for the third piece of the cipher, a mysterious message arrives suggesting that someone close to him is working for Nebula, leaving Cruz unsure of who he can trust.