Question: Which American-born British socialite was Montagu Porch's stepdaughter, and Randolph Churchill's wife?
Sentence (from "Kay Halle"): Katherine 'Kay' Murphy Halle (1904–1997) was a Cleveland journalist, author, radio broadcaster, department store heiress, World War II intelligence operative with the Office of Strategic Services, and intimate confidant and/or mistress of many luminaries of the 20th century, including George Gershwin, Randolph Churchill, W. Averell Harriman, Joseph P. Kennedy, Walter Lippmann, and Buckminster Fuller.
Relevant evidence: No