During this period glossaries of cant were thrown into the shade by dictionaries of slang, which now covered a broad spectrum of non-standard English, including the language of thieves. Julie Coleman shows how Francis Grose's Dictionary of the Vulgar Tongue revolutionized the lexicography of the underworld. She explores the compilation and content of the earliest Australian and American slang glossaries, whose authors included the thrice-transported James Hardy Vaux and the legendary George Matsell, New York City's first chief of police, whose The Secret Language of Crime: The Rogue's Lexicon informed the script of Martin Scorcese's film Gangs of New York.

Cant represented a tangible danger to life and property, but slang threatened to undermine good behaviour and social morality. Julie Coleman shows how and why they were at once repellent and seductive. Her fascinating account casts fresh light on language and life in some of the darker regions of Great Britain and the English-speaking world.