New York: International Polygonics Ltd, (1988). Both a classic locked room mystery and a roman a clef novel set in the science fiction writing world in Los Angeles in the years before World War II. This was the second locked room mystery written by Boucher under the Holmes pseudonym and featured once again the team of Sister Ursula of the fictitious convent 'Sisters of Martha of Bethany,' and Los Angeles police detective Terence "Terry" Marshall. Many characters are thinly-veiled versions of personalities such as Robert A. Heinlein ("Austin Carter") and L. Ron Hubbard ("D. Vance Wimpole"), Some writers' actual pseudonyms were used for minor characters, including "Anson Macdonald" and "Lyle Monroe" (both Heinlein pseudonyms), and Boucher himself appears under his real name of William Anthony Parker White. A Haycraft-Queen Cornerstone. 174 pp. ISBN: 0-93033082X.