Exclusive: Blue Harbor Entertainment will release the Patricia Clarkson-starring drama Lilly, based on the true story of working-class hero Lilly Ledbetter, exclusively in theaters beginning May 9.

Clarkson, who was nominated for an Oscar for her supporting role of Joy Burns in 2003’s Pieces of April, stars as the title character Ledbetter, a real life Alabama tire factory supervisor who aspired to lift her family into the middle class after having grown up in poverty.

She endures a work environment plagued by pervasive harassment for the sake of the best paycheck in the county. As she looks to retire, Lilly discovers that the system has been cheating her, paying her close to half of what the men with the same jobs were earning. Outraged, she fights this injustice to the Supreme Court, the corridors of Congress and eventually the White House all while powerful forces try to shut her down.