"The Master Mind of Mars" by Edgar Rice Burroughs is the sixth book in the Barsoom series. Burroughs moves further away from John Carter by introducing a new hero, Ulysses Paxton, who uses his Martian name Vad Varo for most of the book. Ulysses is a much different hero than John Carter, or for that matter Cathoris or Thuvia from "Thuvia Maid of Mars" or Gahan of Gathol or Tara of Helium from "The Chessmen of Mars". Ulysses's connection with John Carter is that when on Earth he read the stories of John Carter and believed them to be real. The difference is that unlike those who came before, Ulysses/Vlad does not have the skill in hand-to-hand combat that they possessed. This was a very smart move by Burroughs, for what would be the point of making yet another great warrior to repeat the epic adventures which already exist in the series? Instead, the story has a much different feel,...