Sebastian Becker, a former Pinkerton man, lives in England and investigates wealthy eccentrics who may be too insane to care for their own affairs. He is asked to investigate rich landowner Sir Owain, but arrives to discover two young girls have been murdered, and it is not the first time children have come to harm in this small town.

Owain's sanity is in question after a disastrous adventure that killed his family and colleagues, and Becker suspects him of the killings. A smart young suffragette and the wild daughter of a horse trainer had a frightening childhood experience that may hold some of the answers Becker seeks, but only if Becker can convince them to trust him in time.