This is a classic which all sci-fi fans should read, both for its imaginative action and for its subsequent effect on sci-fi authors (e.g. Barsoom reappears in Heinlein's The Number of the Beast). Some will find it dated in light of what is now known about Mars, but that is a part of its charm. Its ethos harkens back to a day when honor and integrity still meant something. A fast read and highly recommended!