Filmmaker Joe Berlinger begins the story of Richard Glossip – a death row inmate who has nearly been executed three times, but maintains his innocence. Now his lawyers hunt down evidence that could exonerate him, before time runs out.

The second episode engages all of the viewpoints surrounding Richard Glossip's case. The confessed murderer claims Glossip forced him to kill. The detective who zeroed in on Glossip defends his investigation. But Glossip maintains his innocence.

The third installment explores Glossip's journey through the court system. Glossip's lawyer uncovers many ways the court system failed his client. News of destroyed evidence is a critical discovery, and sheds light on how Glossip ended up on death row.

The finale delves into Oklahoma's history of botched executions. Glossip divulges his fear of suffering the same torturous fate as other inmates, and forensic accountant Pam Kerr casts doubt on the charge that Glossip had embezzled money.