Voss, criminologist-psychologist, receives a summons to investigate a hotbed brewing in a small New England factory town, where a triple murder eventually occurs. Labor troubles in the factory, and strife between proprietor and manager, plus personal amours gone amuck, provide diverse motives. A fanatical minister is at the bottom of it all -- and Voss gets him. Story end of it good -- detection weakish. Only fair tale all in all.