It is a story of the radio industry (at a time when shows were produced live) set in 1950, during the blacklisting of McCarthyism.
[1] The plot centers around Clement Archer, the director of a successful weekly radio program, who is told by the producers and sponsors to fire four actors and one musician working on the show because of alleged Communist sympathizing.
[2] Matching a sub-plot of the novel, Shaw was named as a Communist in 1951 by the right-wing pamphlet Red Channels "because he signed a petition calling on the US Congress to review the convictions of fellow screenwriters Dalton Trumbo and John Howard Lawson".
[3] Neither House Un-American Activities Committee nor Senator McCarthy are explicitly mentioned in the novel.
According to Shaw himself, he "wanted to show the decent and average American faced with social pressures of which he doesn’t approve".