Charlotte Observer: Director Gavin O’Connor and writer Bill Dubuque lay out a series of small mysteries, built mostly around the enigmatic central character. A few pieces can’t be made to fit, and two of those are big ones. (More on that in a minute.) But the rest of the story has been well-constructed, and the picture it gradually reveals keeps you guessing up to the final scene.
The story begins with a family torn by autism. The mother wants the elder of two brothers to get counseling and live in a sensory-friendly environment. The father insists the way to prepare both sons is to force them daily to confront their limits. When she quits him, he moves households constantly and exposes them to savage martial arts training.