Nasty business, neatly detailed, as the genesis, and accomplishment of a crime sustains a story of murder. Denise, n Daisy, works her way out of the squalor of a London slum as a mannequin, next as a mistress, and after a fairly solid touch, gets to the Riviera where she meets lepidopterist Henry Wycherly, whose money more than offsets his years, his rustic pursuits. Once married to Henry, she finds county life in England as dull as her husband, but conducts herself impeccably if indolently, manages occasional overnight affairs in London, until -- with the war- she meets Trant, R.A.F. hero and ex-jailbird. Two of a kind, they plan Henry's murder, but a minor misstep leads to their apprehension...A study of crime, coolly planned, coldly executed. Mystery novel market.