Your Mother Was a Neanderthal: Time Warp Trio, Book 4
Jon Scieszka, Bryan Kennedy, Listening Library
Audiobook
(Listening Library, April 23, 2019)
Thanks to The Book, Joe, Sam, and Fred are back in the Stone Age, where there aren't any math problems. But there's a tribe of hostile cavewomen, a hungry-looking saber-toothed tiger, a bone-rattling earthquake, and a woolly mammoth who wants to turn them into toe jam. Worst of all, Joe, Sam, and Fred have discovered that writing hasn't been invented yet - so how can The Book get them back home?