The Duel Of Shadows
Written by
Vincent Cornier
Copyright 1934
Published in Pearson's Magazine (UK - Apr. 1934). Reprinted in Mystery Stories #13 (1938). Also reprinted as The Shot That Waited in Ellery Queen's Mystery Magazine (US - Sep. 1950, AUS - Sep. 1948) and in Alfred Hitchcock's Mystery Magazine (US - May 1997). Also reprinted under its original title in The Mammoth Book of Perfect Crimes & Impossible Mysteries (2006). Collected in the book .
According to the narrator, the time that elapsed from the firing of the gun to the bullet plunging into Mr. Westmacott's body was just over 220 years. That bizarre fact is what made the case so very interesting to Barnabas Hildreth.