Mulligan in is negotiations to play a gold-digger who finds herself embroiled in a disastrous get-rich-quick scheme, according to The Hollywood Reporter.
Penned by upcoming Out of the Furnace writer Brad Inglesby, the film is to be directed by Man on a Wire helmer James Marsh.
There is no word yet on which other stars have been linked to the project.
Mulligan recently wrapped filming Baz Luhrman's 3D adaptation of The Great Gatsby.
The movie, which also stars Leonardo DiCaprio, Toby Maguire, Joel Edgerton and Isla Fisher, has recently seen its release date pushed back to summer 2013.
Watch Carey Mulligan in a trailer for The Great Gatsby below: