Saoirse Ronan is on a mission to find her son in trailer for Steve McQueen's Blitz
The film boasts a suitably epic score from Hans Zimmer (who previously worked with McQueen on 12 Years A Slave) and stars Harris Dickinson, Benjamin Clementine, Kathy Burke, Stephen Graham, Leigh Gill, Mica Ricketts, CJ Beckford, Alex Jennings, Joshua McGuire, Hayley Squires, Erin Kellyman, and Sally Messham.