Kim Filby and Elliott's Relationship With the KGB

Elliott is desperate to know whether their friendship, one that Elliott has cherished for over 20 years, has all been a lie. Was Filby always pretending, using him for information? Elliott feels sick at the thought of being so gullible, so open, so trusting. Despite his fury, he's determined to be as professional and courteous as ever. All his MI6 training has led to this moment. But as the minutes pass, Elliott begins to second-guess himself. There's hushed, urgent conversation coming from the MI6 team in the other room. Where is Filby? If he's caught wind of the whole operation, he'll be long gone.