Star of new sci-fi film How I Live Now, Oscar nominated Saoirse Ronan, had to convince The Last King of Scotland director, Kevin Macdonald that she was the right actress for the role.
Initially the Oscar winning One Day in September documentary maker didn't want to cast the Irish actress but she worked hard to change his mind.
She said: “Yeah, I did. I loved Kevin and I loved his work and he actually really wanted an amateur actor so he wanted somebody that had never acted before or he wanted to get kids who were just kids [for the rest of the cast].
"So I met up with him quite a few times over the space of about a year and just spoke to him about the script and he still wasn’t sure about what age he wanted her [lead character, Daisy] to be or anything like that so there was a bit of back and forth for a while, while he was figuring out what he wanted and whether I was going to be free.
"Then when it actually came to him finally making it, I went to audition for him in London and he didn’t think it was terrible so he gave me the part.
"I suppose because I was in it all the time it really became collaborative between the two of us and it felt like we were really working together throughout the whole thing and even still with all the press and stuff, he always lets me know what's going on.
"He’s the best, he’s one of my favourite people that I’ve ever worked with."
It seems that the feeling is mutual as the director said in an interview with The Irish Times: "She's the finest actor I have ever worked with: old, young, male, female."