"The Mastermind of Mars" is the sixth novel set upon the realm of Barsoom by author Edgar Rice Burroughs. The new hero in this book is the second to brave the red planet of Mars. American Ulysses Paxton becomes the chief assistant to the greatest scientist on Mars. Ras Thavas falls in love with Valla Dia, whose mind was transplanted to the ancient body of Xara. Vad Vara attempts to restore his love to her own body and faces a series of obstacles to save her. Another great book of humor and adventure in science fiction.