"Shute's two Australian sf novels remain his best known works of genre interest."
"Much closer to the bone is the famous On the Beach (1957), adapted for BBC Radio as On the Beach (1957) and filmed as On the Beach (1959), a Near Future tale (see Holocaust, Post-Holocaust) in which nuclear World War Three eliminates all life in the northern hemisphere, as confirmed by an Australian submarine sent north to trace a mysterious radio message, but finding the Pacific Rim, including San Francisco (see California), entirely desolated."
It's a story concerning the future and the end of the world, clearly sf.
See the whole entry at: http://www.sf-encyclopedia.com...
There is also an interesting entry on Speculative Fiction.