One of the very best must-read novels of all time - with a new introduction by Roddy Doyle 'A well told tale signifying a good deal; one to be read again and again' THE TIMES 'The book I wish I had written ... It's so far away from my own imagination, I'd love to sit at my desk one day and discover that I could think and write like Ursula Le Guin' Roddy Doyle 'Le Guin is a writer of phenomenal power' OBSERVER The Principle of Simultaneity is a scientific breakthrough which will revolutionize interstellar civilization by making possible instantaneous communication. It is the life work of Shevek, a brilliant physicist from the arid anarchist world of Anarres. But Shevek's work is being stifled by jealous colleagues, so he travels to Anarres's sister-planet Urras, hoping to find more liberty and tolerance there. But he soon finds himself being used as a pawn in a deadly political game.