This volume collects all five Professor Challenger stories by Sir Arthur Conan Doyle, the creator of Sherlock Holmes. Included are:

The Lost World (1912)

The Poison Belt (1913)

The Land of Mist (1926)

When the World Screamed (1928)

The Disintegration Machine (1929)

And if you enjoy this volume, don't forget to search your favorite ebook store for "Wildside Press Megapack" to see more entries in this great series, covering science fiction, fantasy, horror, mysteries, westerns, classics -- and much, much more!

• The Bulldog Drummond Megapack: 15 Adventures
• The Carolyn Wells Mystery Megapack: 17 Classic Mysteries with Pennington Wise, Fleming Stone, & More!
• The Second Carolyn Wells Megapack: 22 Classic books, including mysteries, young adult novels, and verse
• The A. Merritt Megapack: 19 Classic Novels and Stories
• The Second Time Travel Megapack: 23 Modern and Classic Stories