"The People That Time Forgot" by Edgar Rice Burroughs is a fantasy novel first published in 1918. This sequel follows Tom Billings as he mounts a daring rescue expedition to the lost Antarctic island of Caprona, where prehistoric creatures from multiple eras still roam. When his plane crashes in the island's interior, Billings must navigate through lands inhabited by primitive tribes and ancient beasts. Aided by Ajor, a native woman, he discovers the island's extraordinary secret: a unique evolutionary process where individuals transform through successive stages of human development. (This is an automatically generated summary.)