Tom George, the director of Saoirse Ronan's new film See How They Run, has said the Irish star was "on a list of one" for her role in the comedy whodunnit and has credited her with the "domino effect" of other A-listers signing up for the acclaimed movie.
Set in the West End in 1953 and centred around a murder at a party to celebrate Agatha Christie's The Mousetrap, See How They Run puts the world-weary Inspector Stoppard (Sam Rockwell) and too-eager Constable Stalker (Saoirse Ronan) on the case - with hilarious results.
In an interview with the Hollywood Reporter about his big-screen debut, director George was asked to reveal the actor who "got the ball rolling" when it came to casting See How They Run.
"Saoirse Ronan," he replied. "Saoirse was the first person that we thought of for Constable Stalker."
George continued: "It was one of those situations where you have a list of one, and so we took it out to Saoirse. And she loved the script. We had one conversation, much like this, and then she came on board. So it was definitely a domino effect.
"Quite soon afterwards, we had David Oyelowo and Sam Rockwell on board, and that's when we felt we were really on to something. It helped communicate what we were hoping to do with the film.
"There's a version of this script where everything's turned up to eleven and played incredibly arch and theatrical, but having Sam, David and Saoirse attached to it gave a really useful clue to the other people who were reading the script.
"All the way down the ensemble, there's an exciting mix of big-screen film actors and British comedy talent, and it was very exciting to see them come together."
See How They Run is in cinemas now.