Behold this woman

"The woman? She is Clara Ervin, blonde and voluptuous, moving with deliberate feline grace and ruthless secret purpose through the ordinary middle-class world about her. As you meet her, she is living quietly on a Philadelphia back street, as second wife to an aging clerk. A pretty, innocent step-daughter of nineteen, and a fading but faithful servant, complete this commonplace household. Into the Ervins' circle come two young men, drawn by Evelyn's fragile charms--one a childhood sweetheart, the other a wealthy Main Line playboy"--Dust jacket flap.