An early novel by Rose Macaulay about a government program of compulsory selective breeding in a dystopian future England.

In a near-future England, a new government entity—the Ministry of Brains—attempts to stave off idiocracy through a program of compulsory selective breeding. Kitty Grammont, who shares the author's own ambivalent attitude to life, gets involved in the Ministry's propaganda efforts, which are detailed with an entertaining thoroughness. However, when Kitty falls in love with the Minister for Brains, a man whose genetic shortcomings make a union with her impossible, their illicit affair threatens to topple the government. Because it ridiculed wartime bureaucracy, the planned 1918 publication of What Not, whose alphabetical caste system would directly influence Aldous Huxley's 1932 dystopia Brave New World, was delayed until after the end of World War I.