In 2014, the world witnessed the start of a mysterious series of cyberattacks. Targeting American utility companies, NATO, and electric grids in Eastern Europe, the strikes grew ever more brazen, paralyzing some of the world's largest businesses-from drug manufacturers to software developers to shipping companies. ATMs froze. The railway and postal systems shut down. Hospitals went dark. The malware known as NotPetya spread around the world, inflicting an unprecedented ten billion dollars in damage-the largest, most devastating cyberattack the world had ever seen. The hackers behind these attacks are quickly gaining a reputation as the most dangerous team of cyberwarriors in history- a group known as Sandworm, working in the service of Russia's military intelligence agency and targeting government and the private sector, military and civilians alike. A chilling, globe-spanning detective story, Sandworm considers the danger this force poses to our national security and stability. As the Kremlin's role in foreign government manipulation comes into greater focus, Sandworm exposes the realities not just of Russia's global digital offensive but of an era where warfare ceases to be waged on the battlefield. The line between digital and physical conflict, between wartime and peacetime, has begun to blur-with world-shaking implications.