Montmorency is a crime novel and thriller set in Victorian era London, written by Eleanor Updale and published by Scholastic in 2003.

It is at one of these gatherings that Montmorency comes across Sir Joseph Bazalgette, who is the planner and supervisor of the ongoing London sewer project.

Montmorency realises that rich people do not normally smell like sewer water or wear ratty clothes, he finds himself in need of an accomplice—a fellow thief with knowledge, capability, and secrecy to perform the robberies.

Eventually the police pick up a man named "Freakshow", a friend of Montmorency's from his prison days, and pin Scarper's robberies on him.

His first assignment is to break into the Mauramanian embassy and listen for information that could prevent European war, which earns him a permanent position in the British government.

Eventually, Montmorency sheds the Scarper persona and returns all the stolen goods that remain in his possession, resolving to be an honest man.

A professional theatre company, FreeRange Productions, adapted the novel for stage in 2012, performing at Edinburgh Festival Fringe through August of that year.