A confession - I'm an ERB fan. I started with the Tarzan series and graduated to the Mars series. I first read Princess of Mars over 50 years ago as a young teen and fell in love with the incomparable Dejah Thoris - to me a merger of the best of Gina Lollobrigita's Queen of Sheba and Elizabeth Taylor's Cleopatra. I love this series with it's amazing creatures and flying ships [see Star Wars Return of the Jedi for an idea of the martian flyers]. I lost my copy and bought this new one to remind me of the plot in readiness for Disney's John Carter blockbuster. This is fantasy adventure at its best and most original. Like the saturday morning serials at the cinema, this book ends on a knife edge - to be continued in the Gods of Mars. The film may combine parts of both books as some of the film's characters, notably the white Therns, do not appear until the second book.
As you race through this book you will think that you have seen similar things in Avatar and the Star Wars films but ERB, writing in the 1920s, was the daddy. He was even PC, as in "Gods" he explains how the first born, pure race are the Black men of Mars.
I went on to read all the follow on series of books. You will become involved in rooting for all the main characters - even Carter's Calot [ a martian bull terrier but 100 times bigger and uglier], who has undying love for his master. I hope the film lives up to the hype and becomes a successful franchise, which will encourage a new generation of readers to devour all the Martian books and then the Tarzan, Tanar of Pellucidar [inside the earth] and the Venus series as well. Enjoy these books!