Nicola Upson 
Two For Sorrow 

Old sins cast long shadows… Thirty years on from a horrific series of child murders in London, Josephine Tey sets out to write a novel about the crimes' perpetrators: Amelia Sach and Annie Walters, the notorious Finchley baby farmers. Meanwhile, her friend, Inspector Archie Penrose is investigating the sadistic murder of a young seamstress, found dead amid preparations for a star-studded charity gala. The girl's death seems to be the result of a long-standing domestic feud, but Archie is unconvinced; and when a second young woman is involved in an horrific accident soon afterwards, the search begins for a vicious killer who will stop at nothing to keep the past where it belongs…