Iron Sunrise

Not only is Charles Stross' Iron Sunrise a "hard-science fiction masterpiece" (Library Journal), it's also "a Hollywood thriller with a cyberpunk heart" (Entertainment Weekly).

Planet Moscow is vaporized by an unnatural star explosion, prompting those who escaped to counterattack the likely culprit - planet New Dresden of the neighboring system. But New Dresden wasn't to blame, and as worlds go to war, an unseen enemy labors to destroy the universe itself.