At the turn of the twentieth century, Arctic explorer Edward Mackley sets out to reach the North Pole and vanishes into the icy landscape without a trace. He leaves behind a young wife, Emily, who awaits his return for decades, her dreams and devotion gradually freezing into rigid widowhood.
A hundred years later, on a sweltering mid–summer's day, Edward's great–grand–niece Julia moves through the old family house, attempting...

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 change quickly. Suddenly, Team Cousteau jumps into action to rescue a faculty member from the brink of death. Meanwhile, the team follows the Cruz's mother's clues to a magnificent tomb and center of spirituality precariously perched on the side of a cliff. There, Cruz is confronted...

This novel is based on the experience of American explorer John Fremont and his attempt to find a railway route to the West along the 38th parallel, when he becomes trapped in the snowbound Colorado mountains and must fight his way out.

"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...

"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...

Professor Hardwigg, his nephew Harry, and their guide Hans explore a volcanic crater in Iceland that leads them to the center of the Earth and to incredible and horrifying discoveries.