Of Mice and Men by John Steinbeck
Published in 1937, it tells the tragic story of George Milton and Lennie Small, two displaced migrant ranch workers during the Great Depression in California. Based on Steinbeck's own experiences as a bindlestiff in the 1920s (before the arrival of the Okies he would vividly describe in The Grapes of Wrath), the title is taken from Robert Burns's poem, To a Mouse, which read: "The best laid schemes o' mice an' men Gang aft agley." Required reading in many high schools, Of Mice and Men has been a frequent target of censors for what some consider offensive and vulgar language; consequently, it appears on the American Library Association's list of the Most Challenged Books of 21st Century.