World's End is the first novel of Upton Sinclair's Lanny Budd series. First published in 1940, after World War II had begun in Europe the previous year, the story covers the period from 1913 to 1919, before and after World War I.

Upton Beall Sinclair Jr. was an American writer, muckraker, political activist and the 1934 Democratic Party nominee for governor of California. He wrote nearly 100 books and other works in several genres. Sinclair's work was well known and popular in the first half of the 20th century, and he won the Pulitzer Prize for Fiction in 1943.