Dieudonné is best known for two novels of speculative fiction: Rondah, or Thirty-Three Years in a Star (1887) and Xartella (1891). Rondah in particular is notable for prefiguring 20th century science fiction in its descriptions of another planet, and it was well ahead of its time in its sympathetic portrayal of extraterrestrial life. Rondah is about four people who are ported to a new planet still in the process of formation that is inhabited by bird people. It was inspired in part by theories about a possible disintegrated planet between Mars and Jupiter.