Catrin Cole (played by Gemma Arterton) appears married to a handsome but struggling artist/painter Ellis Cole (Jack Huston), and against his wishes decides to get a job in order to shore up the couple’s frail finances. She is hired as a writer to help the established writing team. Catrin is sent to investigate a potentially stirring tale of a pair of twin sisters who take their drink father’s boat to Dunkirk to help in the rescue, and concludes that, despite some serious issues, the material may make a flagship propaganda film.
Posthumous starts out with the premise that an artist’s work is only truly acknowledged and valued after death, and so struggling artist Liam Price decides to fake his own death. Brit Marling plays McKenzie Grain, a journalist whose career isn’t exactly on fire either. She gets introduced to Liam’s work through her art dealer boyfriend, and decides to do a piece on him.