It's the 1940's and Tarzan has enlisted as an pilot in World War II, flying a plane in Africa. He ends up on a rescue mission to recover an agent that crashed in the lost world of Pal-u-don, a place where he hasn't been in over a decade (chronicled in Burrough's TARZAN THE TERRIBLE). Although Tarzan is well into his fifties at this point in time he looks as if he's only about thirty, because of the youth-preserving potion a Witch Doctor gave him and Jane. His main companion on this adventure is an elephant, which he saves from a giant crocodile-and they end up protecting each other. Instead of encountering the familiar primate-like peoples, the Ho-don and the Waz-don, he encounters these strange albino monkey people who worship spiders. The weapon they use are poison darts. Tarzan also meets the "Turtle-people", whose village is built on the carapace of a giant turtle.
This definitely has the feel of the Edgar Rice Burrough's character and if you've been longing for new adventures of the Lord of the Jungle, here it is. Recommended.