Explains how to investigate the natural wonders of caves one small square at a time.

On June 23, 2018, twelve young players of the Wild Boars soccer team and their coach enter a cave in northern Thailand seeking an afternoon's adventure. But when they turn to leave, rising floodwaters block their path out. The boys are trapped! Before long, news of the missing team spreads, launching a seventeen-day rescue operation involving thousands of rescuers from around the globe. As the world sits vigil, people begin to wonder: how long can...

A young amnesiac hero discovers a hidden land and vows to protect the defenseless creatures who live there! Can he stop the mad doctor and learn the truth about his own past?

"The Thea Sisters are going to New Zealand! Their new friend Charlotte wants to show them the sights, and introduce them to Didi, a skeleton of a bird that went extinct many years ago. But when they get to the mouseum, Didi has gone missing! Can they find the stolen skeleton before it is too late?"--

When a mysterious treasure map appears in Odyssey, Mr. Whitaker, Dylan, Connie and Eugene set out on a dangerous journey that leads them to the caves of Qumran in Palestine. But a sinister Mr. Faustus and his cronies are also hot on the trail. Who will find the treasure first? Will it be for gold and riches, or something even better?

A novel set 25,000 years ago is the sixth book in the author's landmark series and continues the story of Ayla and Jondalar.

A dog named Robot pokes his nose into a hole in the ground. What is down there? Four boys have come with the dog to find out.

"When Tribal Police Officer Bernadette Manuelito arrives to speak at an outdoor character-building program for at-risk teens, she discovers chaos. Annie, a young participant on a solo experience due back hours before, has just returned and is traumatized. Gently questioning the girl, Bernie learns that Annie stumbled upon a human skeleton on her trek. While everyone is relieved that Annie is back, they're concerned about a beloved instructor who went...

While on a dig in a Romaniam forest, a group of scientists make a startling find. Dating back to the 13th century, they find a huge addey, which was built over the entrance to a massive network of subterranean caves. Eager to learn what lies within the caves, the scientists discover to their peril that a large part of the cave system is under water. The scientisits hire a team of American spelunkers who are trained in exploring underwater caves. The...

A hairy mammoth takes a cheeky little baby on a thrilling ride through a moonlit landscape.