It delivers its own wide-view take of CIA office politics, the shift between the Bush and Obama administrations, the use of torture and how the bin Laden manhunt ran out of steam - Bigelow and Boal had been working on a story about the failure to find him in Tora Bora, then started over in the wake of his demise.
That big picture stuff is a framework for us to follow Agent Maya , who starts as a newbie doing her best not to flinch as she observes her first interrogation but who quickly toughens up and spends the next eight years picking through whatever leads she can, ambivalent about how they are created.
Her detective work done, she has to stand back and watch Seal Team Six go to work.
The night vision depiction of the 12.30am - zero dark thirty - raid on bin Laden's Abbottabad compound is heart-stoppingly suspenseful as we follow the squad door by door, floor by floor, shot by shot.
Curiously perhaps, Maya comes unburdened by any back story or attachments outside work. But she's still a riveting character, especially when it's clear - as James Gandolfini in a cameo as then-CIA director Leon Panetta finds - that the smartest guy in the room happens to be the inscrutable redhead down the back.
Stars: 4/5
Cast: Jessica Chastain 
Director: Kathryn Bigelow 
Rating: M (violence and offensive language) 
Running time: 157 mins 
Verdict: Gripping account of the hunt for Osama Bin Laden