As Fisk moves into swanky new digs amid a public outcry, Matt wrestles with how far he's ready to go to right this wrong. Dex's aim comes into focus.

To quell the rising backlash over his release, Fisk serves up a scapegoat to the FBI. Dex misses the mark when he runs into a woman from his past.

Driven to the edge, Dex loses his way until he's offered a lifeline by Fisk. Matt comes to Karen for help, which she agrees to give -- on one condition.

A desperate Dex reaches out for help, Matt forms an uneasy alliance with Agent Nadeem, and Karen concocts a dangerous plan to provoke Fisk.

In the season finale, Matt prepares to cross the line, as Dex becomes more dangerous than ever and Fisk enacts his endgame.