Dexter decides he's going to eliminate Hanna McKay and gathers evidence that she has eliminated a number of people in her life. Something unexpected occurs however. LaGuerta begins to think that the Bay Harbor Butcher may have been responsible for the deaths of several criminals who vanished before they could be arrested. After discussing the situation with Nadia, Quinn decides to return the money left in his car. He's given little choice but to help the mobsters: either he eliminates the blood evidence they have linking Isaak Sirko to the Colombian shooting or Nadia ...