Saoirse Ronan has been through a big couple of years, despite being such a young actress, the highlights of which have probably been her breakout performance in the period (time, not menstrual) thriller Atonement, and her starring role in Joe Wright’s slick assassin movie Hanna. Despite such lofty accomplishments, it’s starting to look like 2012 is going to be her biggest year yet. She’s currently filming a Neil Jordan movie called Byzantium, she co-stars in recent festival assassin flick called Violet & Daisy, and she’s also set to star in an adaptation of Stephenie Meyer’s non-Twilight young adult novel The Host. Sounds like the girl has a busy schedule, but somehow she’s managed to squeeze another project in. Variety is reporting that the budding young starlet has now signed to head the next film by Kevin Macdonald (the guy who made The Last King of Scotland, not the Kids in the Hall guy, that’s Kevin McDonald), How I Live Now. This one is also an adaptation of a novel about young people, but decidedly less creature filled and much more war torn than Meyer’s book. “How I Live Now” was written by Meg Rosoff, and Amazon describes its plot as such: