BOY A is 24 and called Jack.  Released from prison from a terrible crime, Jack (Andrew Garfield) aims at a new life with the aid of social worker Terry (Peter Mullan).  Based on the novel by Jonathan Trigell and written for the screen by Mark Rowe, the second collaboration between Rowe and director Crowley after INTERMISSION is another assured piece of filmmaking.  The film can be considered to be two stories, one told in flashback, of Jack and the other of him as an innocent boy, led astray by a new but vicious friend.  BOY A is largely compelling as Crowley and Rowe feeds the audience only bits of information at a time letting the audience piece the bits together like a puzzle.