Format: Global Grey free PDF, epub, Kindle ebook
Pages (PDF): 168
Publication Date: 1944
This is the sixth book in the Pellucidar Series. This is the penultimate novel in the series and the last to be published during Burrough's lifetime. Unlike most of the other books in the Pellucidar series, this novel was never serially published in any magazine because it was rejected by all of Burroughs's usual publishers. The novel tells the adventures of David Innes on his return from Lo-Har to Sari in the wake of the events of Back to the Stone Age.