Tahar Rahim and Kevin MacDonald have come some way since their first collaboration on "the Eagle" (2011). This one sees the former - Mohammed Ould Slahi - incarcerated, without charge, by the American authorities in Guantánamo Bay. His case comes to the attention of attorney Nancy Hollander (Jodie Foster) and together with her colleague Teri Duncan (Shailene Woodley) they fight tooth and nail to secure his release. Benedict Cumberbatch is their opponent, the formidable and honourable Col. Crouch, and as the story unfolds both parties begin to appreciate the extent of the atrocities being carried out. Rahim is super. His portrayal demonstrating startlingly well the extremes of human endurance - of body and spirit - as Hollander works tirelessly to secure his release. There have been a spate, of late, of these style of films that point the finger squarely as successive US administrations who use the rule of law as/when and if it suited them - regardless of their red or blue politics - and this poignantly delivered documentary-style film uses dialogue potently (and sparingly) as well as flashback and actuality-effect photography to gradually (OK, maybe a bit too gradually) depict the backstory of this young man - whom, so far as we know is guilty of nothing at all - really sensitively and powerfully. This is not a film that sees much actually happen in any traditional sense, and if you have read any of his best selling "Guantánamo Diaries" then you will know just how this legally protracted story concludes, but as an assessment of a state's attempts to systematically dehumanise a man; and of the blind obedience of some of it's servants in-so-doing, it is a compelling film to watch that cannot fail to leave a nasty taste in your mouth.