Nash creates a diversion to ensure his asset, a mole in Russian ranks code-named Marble, escapes detection. Since he cannot return to Russia, he is assigned to Budapest, where he will regain contact with Marble.
Dominika is sent to train to become a Russian operative, known as a 'Sparrow', capable of seducing her targets.
But when Dominika contacts her superiors to reveal the identity of the mole, she frames her uncle Ivan rather than betray Korchnoi.
Ivan is killed by the Russian side during a spy swap, and Dominika is congratulated for her work by her Russian superiors.
The dearth of effective prevention strategies available to date may reflect a lack of fit between the design of many of the existing programs and the principles of effective prevention identified by Nation et al.