Deadline reports that Chastain came up with idea for 355 after being inspired by the story of Agent 355, an 18th century woman who became one of the first secret agents in the American Revolution.

The film will be produced by Chastain’s company Freckle Films, with a script by Cat Woman and Harriet the Spy screenwriter Theresa Rebeck. Simon Kinberg, who directed Chastain in next year’s X-Men: Dark Phoenix, has expressed an interest in directing.

This isn’t the first time Chastain has proved that she put her money where her mouth is when it comes to advocating for women in cinema. She has been an active and unapologetic presence in the #MeToo and Time’s Up movements, and revealed last April that she refuses to star in films without a clause in her contract stipulating that she earns the same as her male co-stars.

She used the same strategy to ensure Octavia Spencer was paid the same as her on an upcoming film, a sign that she recognises the additional barriers faced by women of colour in Hollywood. “She’s walking the walk and she’s actually talking the talk,” said Spencer. “I love that woman.”

Stylist’s Visible Women campaign is dedicated to raising awareness of women who’ve made a difference, celebrating their success, and empowering future generations to follow their lead. See more from Visible Women here.

The cast of Jessica Chastain’s new woman-led spy film is unbelievably good