four members of the Coverdale family George, Jacqueline, Melinda and Giles were murdered in the space of 15 minutes. Their housekeeper, Eunice Parchman, shot them, one by one, in the blue light of a televised performance of Don Giovanni.
When Detective Chief Superintendent William Vetch arrests Miss Parchman two weeks later, he discovers a second tragedy: the key to the Valentine's Day massacre hidden within a private humiliation Eunice Parchman has guarded all her life.
