Atomsk, first published in 1949, is a Cold War spy novel by "Carmichael Smith", one of several pseudonyms used by Paul Linebarger, who wrote fiction most prolifically as Cordwainer Smith. Written two years after Winston Churchill's Sinews of Peace address, Atomsk is the first espionage novel of the Cold War, inaugurating a genre exemplified by such writers as Ian Fleming and John Le Carré.