When young cook Kat Holloway learns that the children of London's Foundling Hospital are mysteriously disappearing and one of their nurses has been murdered, she can't turn away. She enlists the help of her charming and enigmatic confidant Daniel McAdam, who has ties to Scotland Yard, and Errol Fielding, a disreputable man from Daniel's troubled past, to bring the killer to justice. Their investigation takes them from the grandeur of Mayfair to the slums of the East End, during which Kat learns more about Daniel and his circumstances than she ever could have imagined.