Memories of the past set Red on a dangerous collision course with an enemy determined to destroy his criminal empire.

Alone in a foreign country after a mission goes catastrophically wrong, Katarina Rostova goes on the run to avoid the forces trying to hunt her down.

As Liz pushes a source for answers, Red and the task force grapple with the implications of her actions. Tensions boil over and a drastic action is taken, which will change Red and Liz's relationship forever.

When Reddington takes Liz to the mysterious epicenter of his empire, their shared past reveals itself and long buried secrets are divulged.