First published in 1918, Edgar Rice Burroughs’s The People That Time Forgot continues The Land That Time Forgot as Tom Billings leads an expedition to Caspak in search of Bowen Tyler and the other missing survivors. After flying over the island’s immense cliffs and crashing in its interior, Billings struggles through a dangerous world of prehistoric beasts and human groups representing different stages of development, eventually joining forces with a native woman named Ajor. As they journey northward, he discovers Caspak’s extraordinary evolutionary system, in which individuals may progress through successive stages of human development during a single lifetime, while fighting to protect Ajor and survive the strange lost world around them.