It's strange to discover that "Blitz" is the most anonymous movie that Steve McQueen has made thus far, as this pseudo-Dickensian epic - the story of a half-Grenadian boy's quest to reunite with his guilt-ridden single mother (Saoirse Ronan) after she evacuates him out of London in the fall of 1940 - would appear to be an ideal showcase for his singular vision as a filmmaker.