Bill Fleming. New York: Dell Publishing Company, Inc. 1942. Not paginated. 4 1/4 x 6 3/8 inches. Stapled wrappers. A bright clean copy with a touch of edgewear and a few creases near the spine. Near Fine. Wraps. 
A Dell 10 cent book, #11 in the series. "A cheap and evil girl sets a hopped-up killer against a city". The story first appeared in Detective Fiction Weekly - here published complete and unabridged.
William Irish is a psuedonym for Cornell Woolrich. "In was in 1933 that he discovered it was more profitable to kill his characters rather than let them live happily ever after, and this he has done ever since." (from About the author)