Edgar Rice Burroughs created the well-known character Tarzan, as well as John Carter, the adventurer of Mars.
A Princess of Mars is the first volume in the Barsoom Series, telling the adventures of John Carter, a confederate veteran of the American Civil War, who finds himself mysteriously transported to Mars, called Barsoom by its inhabitants. 
On Barsoom, John Carter will find himself in the middle of a civilisation’s war, and will fall in love with the fascinating Dejah Thoris, a princess in danger. 
What side will John Carter choose, and how will he win the princess of mars’ heart ?
You’ll discover it in this first volume of the Barsoom Series.