Amid assignments that take the Academy recruits from the iceberg-filled waters of Antarctica to the bone-dry deserts of Argentina, Cruz 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. Even after completing dozens of high-risk missions and traveling the globe, Cruz could never prepare himself for one ultimate surprise. The Forbidden Island is available for pre-order now.

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. 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. The Dragon’s Blood is on sale now.

On an island nation in the Indian Ocean, the explorers venture through a vast underwater world and take part in a friendly robotics competition. But the tides of good fortune turn when suddenly Team Cousteau is forced into action on a rescue mission. Cruz’s quest to find the final pieces of his mother’s cipher leads him to a remote place where a life-or-death showdown ensues and makes him question his own mortality. The Tiger’s Nest is on sale now.

Lush jungles and sweeping savannas, home to elusive mountain gorillas and fierce big cats. Unforgiving, endless deserts that may be hiding more than meets the eye. An adventurer's dream come true for the students aboard the Explorer Academy ship Orion. But no sooner do they arrive than danger strickes again, and this time, one of Cruz's closest friends becomes the unintended victim. The Star Dunes is on sale now.

The adventure continues for Cruz, Emmett, Sailor, and Bryndis as they continue their studies at sea and travel to exotic locations around the world. A mysterious person alerts Cruz to impending danger while he and a few trusted pals explore ancient ruins and search for another piece of the puzzle his mother left behind. The Double Helix is in stores now.

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. The Falcon's Feather is on sale now.

Cruz Coronado applies to attend an exclusive school for explorers, the Explorer Academy, where his mother worked before dying in a mysterious lab accident. Plunged into a world of critical missions and code breaking, Cruz embarks on a global hunt for a secret formula that could reveal his hidden past. But it might be difficult—especially when you don’t know who you can trust. The Nebula Secret is now out in paperback.