When the World Shook; being an account of the great adventure of Bastin, Bickley and Arbuthnot
Henry Rider Haggard
This book is available for download with iBooks on your Mac or iOS device, and with iTunes on your computer. Books can be read with iBooks on your Mac or iOS device.
The book is, at its core, the adventures of a troubled agnostic and his buddies the atheist and the believer, as they explore a mysterious island and meet the powerful man-god-king asleep in its bowels. They also argue philosophy and theology a lot.