Tarzan: the Lost Adventure
Joe R. Lansdale
 In Burroughs' last Tarzan story, left unfinished at the time of his death, the ape man plays guardian to an expedition seeking the lost city of Ur. In addition to Tarzan himself, his animal companions Jad-bal-ja, the golden lion, and Nkima, the little monkey, are also brought back for one last swan song. Burrough's manuscript ends before Ur is reached, but in the novel as completed by Lansdale, Ur turns out to be a society revering a giant and supposedly immortal praying mantis, which is used to slay condemned prisoners in the arena. Tarzan speculates that the creature is originally from the underground world of Pellucidar, to which Ur is connected by a system of caverns and passages. Trapped underground at the end of the story, he seeks escape by seeking out the route to Pellucidar himself.