Deep in the shadowy reaches of the mind lurks the dark shape of evil. In an unguarded moment, it can leap forth, catching the innocent in its piercing talons. Three men, all well-respected, highly successful businessmen in early middle-age, are killed, one after another, exactly a month apart. Is there a connection? Is this a new twist in the annals of serial killing? Homicide Detective Harry Stark is called upon to solve these crimes, with the assistance of young detective Noel Harris. The solution takes them into nether worlds of different kinds, and along the way, they encounter more bodies and greater evil. Stark falls in love again and Harris doesn’t betray Stark’s faith in him.