Helena Bonham Carter and Brendan Gleeson are also featured in the movie, with a script by Abi Morgan, and directed by Sarah Gavron (Brick Lane, The Village at the End of the World).
Emmeline Pankhurst (1858-1928), founder of the Women's Social and Political Union in the U.K., was jailed repeatedly for leading protests, sometimes violent ones, which eventually led to women finally winning the right to vote (known as "suffrage") in Great Britain in 1918. Her efforts also inspired American suffragists, who won the vote the following year.
The film centers on Mulligan's character, a working wife and mother, who gets drawn into the movement.
Below is the trailer: