Steve McQueen’s “Blitz” follows the epic journey of George (Elliott Heffernan), a 9-year-old boy in World War II London, whose mother Rita (Saoirse Ronan) sends him to the safety of the English countryside. George, rebellious and determined to return home to his mother and grandfather Gerald (Paul Weller) in East London, embarks on an adventure only to find himself in great danger when a distraught Rita searches for her missing son.