Last year, Jessica Chastain was a complete unknown. Now she’s in everything – with everyone. She tells Steve Rose about working with Pitt, Pacino, Fiennes, Redgrave … There’s nothing we like better than an overnight success story, but Jessica Chastain ‘s feels just too good to be true. A perfect storm of Chastain movies, swelled by critical adulation, is currently heading for our shores, in what looks like a co-ordinated assault on the awards season. Earlier this year we had a taster, with the release of Terrence Malick’s Cannes-winning The Tree of Life , in which Chastain played Brad Pitt ‘s wife – as auspicious a debut as any actor could hope for. And this week the deluge begins. First there’s The Debt, an espionage drama starring Helen Mirren . Then Chastain teamed up with Sam Worthington in steamy murder mystery Texas Killing Fields . Plus, there’s civil rights Oscar bait The Help , already a hit in the US; the apocalyptic fable Take Shelter , another winner at Cannes; Ralph Fiennes ‘s Coriolanus , relocated to war-torn Bosnia, with Vanessa Redgrave ; The Wettest County in the World, a depression era saga scripted by Nick Cave and starring Tom Hardy and Gary Oldman ; and Wilde Salomé , the film version of Al Pacino’s theatrical crowd-pleaser. A year ago, Chastain was a complete unknown. Now she’s in danger of saturating the market. In a seedy diner somewhere in LA, there is probably a failed actor wondering who stole all her luck. And the answer could be the sunny, chatty, immaculately turned-out 30-year-old sitting in front of me. Although it’s a drizzly London morning, Chastain looks as if she’s just stepped in from a 1950s garden party: she’s wearing a sleeveless turquoise dress that sets off her red hair. Her feet