After escaping death at the hands of a ruthless murderer while honeymooning in Constantinople (Tears of Pearl), Lady Emily is recuperating from her wounds at her mother-in-law's estate in Normandy when, while out horseback riding in the countryside, she comes across the body of a young woman who has been horribly murdered. Her wounds are identical to those inflicted on the victims of Jack the Ripper, who is wreaking havoc across the channel in London. Lady Emily and Colin learn that the victim is the daughter of a high born family of French aristocrats who had been committed to an asylum for the insane. While there, she had given birth to an illegitimate child who was spirited away and may be dead. As Lady Emily pursues a trail of clues (and bodies) to the beautiful medieval city of Rouen and a crumbling chateau in the country, she begins to worry about her own sanity: she hears the cries of a little girl she cannot find and discovers blue ribbons left in the child's wake. Emily is on the verge of solving the mystery, when she is suddenly taken captive by the killer and held in an isolated tower where she once again hears the eerie cries of the lost child. She has to muster all her courage in a terrifying game of wits against a cold and brilliant murderer or she will be his next victim.