The Polygon from Alpha Centauri

From Author Wars - https://authorwars.com/books/the-polygon-from-alpha-centauri-1972645.html

Overview:

Title: The Polygon from Alpha Centauri
Author: James Powell
Year: 1984
Type: Short Fiction

Editions/Publications:

Unknown. Ellery Queen's Mystery Magazine, July 1984 (Unknown, James Powell, Davis Publications, $1.75, 161 pages, digest, MAGAZINE)