Despite suffering greatly from being far too expositional, still manages to somehow get under your skin and is likely to stay with you long after the credits have rolled.

The complexity of Felt's motives are left untouched in the interests of having a fiercely principled hero at the film's centre.

Unfortunately, the movie around him is as flat and formulaic as a Washington pen-pusher.

Should be an engaging picture of the backrooms of power and the machinations that brought down a government but instead it is a talky affair that relies on exposition rather than thrills.