The frightening single-mindedness of Communist Party workers really comes across in this true account of a Los Angeles suburban housewife and mother who spent five years within the Party as a double-agent for the F.B.I. Marion Miller's husband Paul had himself been a double-agent when he was in the Merchant Marine from 1939 to 1943, and so when she received an invitation in 1950 to join what Paul spotted as a ""front"" organization, it was he that suggested that she contact the F.B.I. From, that time until she collapsed with ulcers in 1955, Mrs. Miller's life was a nightmare of surreptitious note-taking at meetings, copying and photographing correspondence entrusted to her, attending meetings and parties for the Communist cause, and narrow escapes from discovery. At the end of all this, Marion Miller testified in public for the Government, and was rewarded by a series of Communist smears that prevented her life from returning to normal. This is not a closely reasoned, theoretical attack on Communism. Its value lies in the immediacy of the picture it presents of a woman of conventional background who found the strength to take action against a group of people whose actions and ideals she found intolerable.