Another of the lesser known HIBK (Had I But Known) authors praised by Howard Haycraft in his classic 1941 mystery genre survey, Murder for Pleasure, is Margaret Neilson Armstrong (1867-1944), a remarkable woman of many talents who happened to write three critically praised mystery novels near the end of her life (for Part One of this series see Anita Blackmon: HIBK Queen of Arkansas ). Born into one of New York's most socially prominent families, Margaret Armstrong surely had one of the most…