Filmed largely indoors and in often claustrophobic spaces, the movie isn't always subtle, but its impact is felt particularly in the scenes featuring Rahim. His powerful performance is supported respectfully by Foster, Cumberbatch and Woodley.

The subject is charismatic in a way that the film is not. But he is VERY charismatic, and it's his performance that sees this through.

The real-life story is enraging, and it's fun to see Benedict Cumberbatch's morally conflicted military prosecutor lock horns with Foster's icy human rights lawyer.

Adding little touches, like the way he smells a packet of McDonalds takeaway, to him breaking into a toothy smile when he hears about his younger brother having a second child, Rahim’s performance is close to flawless.