Tom must recover a valuable capsule left on Earth on the ocean floor off Easter Island thousands of years ago by colonists from another planet.

Tom Swift, Jr., and his associates at Swift Enterprises discover that their invention, the 3-D telejector, is marked for destruction by Group Q.

Tom constructs a large, heavy brass-bound oak chest to hold his blueprints, formulae, and models until an underground vault can be built. But Tom is attacked and his possessions—including the chest—are suddenly missing, along with hie friend Koku. Tom must discover who stole his Chest of Secrets and save Koku from the villains...if he can!

A super submarine especially designed for deep-sea research and exploration encounters strange green bubbles that feed on manganese nodules and are capable of engulfing and destroying large objects.

In 'Tom Swift and His Giant Telescope' by Victor Appleton, readers are taken on a thrilling adventure as young inventor Tom Swift unveils his latest creation - a powerful telescope with capabilities beyond imagination. The book, written in a straightforward and engaging style, is a wonderful blend of science fiction and adventure, appealing to readers of all ages. Set in the early 20th century, the novel captures the spirit of discovery and innovation that characterized the time period. Appleton's vivid descriptions of the telescope's construction and its use for solving mysteries make the story both educational and entertaining. Fans of science fiction and technology will find this book a delightful read. Victor Appleton, a pseudonym used by the Stratemeyer Syndicate, was the author of the popular Tom Swift series, reflecting his interest in science and technology. His background as a journalist and his passion for invention contributed to the authenticity and excitement present in the book. Recommended for those who enjoy a mix of science, adventure, and mystery in their reading.