In late October 1867 Inspector Ben Ross of Scotland Yard walks home across Waterloo Bridge and the fog swirls around him like a living beast. Reports that 'the River Wraith' has been terrorising young women on nights such as these give Ben cause for concern. And rightly so. By the time the fog has lifted a woman lies murdered in Green Park. Allegra Benedict was the beautiful Italian wife of a renowned art dealer. But why had she travelled to London to sell a brooch in the Burlington Arcade just hours before her death? As Ben begins his investigation, his intrepid wife Lizzie--with the help of their maid Bessie--looks into Allegra's private life and uncovers more than one reason why someone might want her dead.