On a flight to Moscow, 20 August 2020, Russia's charismatic opposition leader, Alexei Navalny started to scream in agony. The flight immediately diverted to the nearest city and he was rushed unconscious to hospital. What happened next shook the world. With interviews, almost entirely from those 'in the room', this film pieces together the incredible true story of the plot to kill Navalny - by poisoning his underpants.