While The Son of Tarzan gets off to a promising start, the second half was disappointing compared to the previous books in the series. The title character, Jack/Korak, suffers from not being as interesting as his father. The books lacks a compelling antagonist as well, replacing the strong villain Rokoff with a small and continually rotating rogues gallery that appear small time by comparison.
There's a fair amount of jungle adventure to be had in this installment. Jack's adjustment to life in the wilderness and his life with the ape Akut are the highlights of the novel. However, the plot takes a sharp turn halfway in, with almost the entire remainder of the book focusing on the least interesting character in the story. Perhaps a more fitting title would have been The Son of Tarzan's Girlfriend.
Despite the above complaints, the climax and denouement go a long way in redeeming the overall story. While nowhere near as strong as The Beasts of Tarzan, this book is still worth a read.
Despite being the 6th novel in the series, in this story Burroughs proves that there are plenty of stories left to tell on Barsoom, and that John Carter or Carthoris don't need to be present to have a compelling story.
Our protagonist is a World War I soldier with the incredibly badass name Ulysses Paxton. When he gets blown in half by an artillery shell, he finds himself on Barsoom, a planet he knows well from Edgar Rice Burrough's stories. I like that—as with John Carter's original teleportation to Mars—Burroughs doesn't go into detail about how the journey takes places. Paxton himself has no time to care, he immediately gets attacked by an angry local. I also like that there aren't any An Occurrence at Owl Creek Bridge hints that Paxton's adventures are dying hallucinations. Paxton's adventures are genuine.
Like many of the Barsoom stories to date, the plot involves a dashing man's quest to rescue a damsel in distress. While this is familiar territory, Burroughs gives it a twist in this story by having the body of Paxton's love interest be spirited away, while (due to a brain transplant at the hands of a fun mad scientist character) her mind remains prisoner in the used-up body of a rich harridan.
Through charisma and respect-earning manliness Paxton quickly assembles a team of trusted comrades, including a master assassin and an experimental gorilla/human hybrid. The pace of the book is brisk and there's plenty of swashbuckling action to be had. Burroughs is clearly sticking to an established recipe, but the meal is satisfying.