The mission of Major Atherton is a television mini-series in three parts. This true story is made up of two episodes that show Operation Hydra. After the fall of the Uzice Republic and the success of the first enemy offensive, the British sent their mission and this series shows the events and the fate of the three operatives of the British secret service, SOE led by Major Terrence Atherton, who, during the Second World War, in early 1942, came to what was then occupied Yugoslavia in order to determine whether the Partisans or Chetniks were actually fighting against the occupying forces or against each other.