The epic, WWII drama will be called 'Darkest Hour'. It will be produced by Lisa Bruce and Working Title partners Eric Fellner and Tim Bevan.
Working Title acquired McCarten's script that focuses on Churchill and a make-or-break moment of truth he faced in 1940, reported Variety.
"We aim to present a Churchill you haven't seen before, a new portrait that shows all his famous strengths but also adds new dimensions, such as the grave doubts he privately harbored, the dark moods that would seize him unexpectedly and his fear of failure, a driving force that is often left out of any discussion of the man," McCarten said.
The production of the film will begin from next year.
McCarten is currently adapting book 'Hack Attack: The Inside Story Of How The Truth Caught Up With Rupert Murdoch'.