Twilight Robbery is a children's or young adults' comic fantasy novel by Frances Hardinge, published on 4 March 2011 by Macmillan in the UK, and, under the name Fly Trap, by HarperCollins in the USA.

It is set in the same grotesque fantasy world of The Realm, which Hardinge describes as bearing some similarity to early 18th century England.

Frances Hardinge based this idea on a number of British places which have legends of a Luck, an object whose loss or breakage would presage disaster.

[1] At the end of Fly By Night, Mosca and her goose have left the city of Mandelion for life on the road with conman Eponymous Clent.

This leads to a series of increasingly dangerous adventures for Mosca, crossing the boundary between Toll-by-Day and Toll-by-Night, and impinging on the high politics of the Realm.