"I did think the shocking nature of Laura's ability to kill savagely would be all the more shocking, in a really wonderful way, that it was a girl and not a boy, that that lethalness would be exhibited by this little girl," Mangold said. "I wondered whether we could pull it off, whether the audience would truly believe this level of violence and intensity trapped inside an 11-year-old body. To me that made it even more exciting to put it on the screen."
"From the very beginning when we set out to make the movie, the one thing we knew is that we wanted to make a movie about family," he said. "Not the kind with a girlfriend or a wife, but the kind where it's forever, and it's your child, or it's your father."