Power Play (1978)

A hidden gem from the 1970s, "Power Play" brings an ensemble cast together as military officers in a fictional country, planning a coup d'état against the unpopular, corrupt and authoritarian regime. David Hemmings and Barry Morse lead the conspirators with more big names being recruited as the movie progresses. The country's ruthless security police, headed by a sinister Donald Pleasence, soon begin to suspect something is going on and the tension is ramped up in the days leading to the planned revolution. Officers become unreliable, plans go awry and it becomes apparent there is a traitor amongst the military leadership. The ending includes some of the biggest and most unexpected twists that I've ever seen on screen. Highly suspenseful throughout with many action scenes towards the end as the coup gets underway. Highly recommended.