The 1953 Iranian coup d'état was the overthrow of the democratically elected government of Iran in favour of strengthening the monarchical rule of the Shah for the purposes of foreign access to Iran's oil. BP was at the heart of this story. The operation was orchestrated by the United States under the name TPAJAX Project (Operation Ajax) and the United Kingdom under the name Operation Boot. While making a documentary about this CIA/MI6 coup, Iranian director Taghi Amirani and editor Walter Murch discover never seen before archive material hidden for decades. The 16mm footage and documents not only allow the filmmakers to tell the story of the overthrow of the Iranian government in unprecedented detail, but also leads to explosive revelations about dark secrets buried for 67 years. Working with Ralph Fiennes to help bring the lost material to life, what begins as a historical documentary about four days in August 1953 turns into a live investigation, taking the film-makers into uncharted cinematic territory.