As former U.S. president turned special commission investigator George Mullen ( Robert De Niro) delivers a climactic closing speech in the final scene of Netflix's new political thriller Zero Day, it's this admission that gets to the heart of the show's message about the importance of truth in today's world.

Let's break down the explosive series finale of Netflix's "Zero Day," a cautionary tale about autocracy, misinformation and cyberterrorism.

Lizzy Caplan, 42, stars as Alexandra Mullen, President Mullens’ daughter and a current congresswoman. Alexandra is often publicly at odds with her father and is named as the head of the Congressional Oversight Committee formed to keep an eye on her father’s investigation.