novel, Agar is pivotal to the eventual success of the Great Train Robbery, though he is also largely responsible for the culprits' eventual capture. He is apparently very well-acquainted with many criminals and helps Pierce identify many persons of interest including the informant Chokee Bill as well as the snakesman Clean Willy. Though he becomes a police informant at the end of the book in hopes of avoiding transportation to Australia, the judge sends him there anyway and he dies a wealthy man. Michael Crichton depicts Robert Agar as Pierce's lackey with limited intelligence, though his real life counterpart actually masterminded much of the robbery and got away with minor punishment. Clean Willy - generally acknowledged to be the best snakesman available in London although his skills were apparently inadequate to prevent arrest and incarceration (which occurred at least twice before and during the story). Edward Pierce goes to great expense to help Willy escape from a high-security prison for the sole purpose of enlisting the snakesman's aid in the train robbery. After successfully completing his tasks, Willy is paid off by Pierce and disappears for some time from the narrative before resurfacing as a police informant, almost jeopardizing the entire scheme. Ultimately he is garroted by Barlow in a boardinghouse. Barlow - a violent thug and former mugger who serves Edward Pierce loyally as a cabby, although his services are also employed for other purposes, such as the murder of Clean Willy. He and Miss Miriam manage to elude capture by the authorities, eventually rescuing Pierce from the authorities before the trio completely disappears. Miss Miriam - Edward Pierce's mistress who is generally regarded as highly attractive by other characters in the book. She is also a talented actress and plays rather brief though important roles in the execution of the train robbery (such as pretending Agar is her dead brother and distracting Mr. Fowler while Pierce unlocks the baggage car). In many ways, she and Pierce are very similar and well suited for each other: both are resourceful and possess the ability to mix with men and women of all classes. Background Crichton became aware of the story when lecturing at Cambridge University. He later read the transcripts of the court trial and started researching the historical period. Historical deviations The story is a fictionalised representation of the historical events that happened, although the setting can be considered