I just finished reading the 2006 novella (23,800 words) Missile Gap by Charles Stross. The book is out of print, but its publisher has placed the full text on the Web where you can read it for free. This is one of the weirdest stories I’ve read in some time, combining aspects of Ringworld, The Long Earth, 1632, eschatology, alternative history, the simulation hypothesis, hive minds versus individuals, and cold war thrillers. Characters include Yuri Gagarin, Robert McNamara, Leonid Brezhnev, Carl Sagan, and Gregor Samsa.
I’m not saying it’s great, but if you’re looking for weird, you’ll find it here and—it’s free. (For some reason, the publisher has set it in a small font, You way want to use your browser’s Zoom function to enlarge it.)