This is a must-read book for all science fiction enthusiasts. "The Invincible" by Stanislaw Lem is a timeless classic that will leave you on the edge of your seat. Published in 1976 by Penguin Publishing Group, this vintage mass-market paperback has 223 pages and weighs only 0.3 pounds. The story follows the crew of a spaceship, who go on a mission to investigate the disappearance of a previous mission. The narrative is gripping and will keep you engaged till the very end. Get your hands on this Ace Science Fiction Special #4 edition of "The Invincible" and experience the thrill of this sci-fi masterpiece.