Focuses on a new lead involving organized crime and local law enforcement.

In 2021, "Relentless" refers to two major releases: a and a high-stakes thriller novel . This guide covers the key details for both. Relentless: Missing in Missouri (TV Mini-Series)

This six-part investigative docuseries follows filmmaker Christina Fontana as she searches for Christina Whittaker, who disappeared from Hannibal, Missouri, in 2009.

The series is available for streaming on Amazon Prime Video .

Introduces the case and explores early leads in Hannibal.

Published in 2021, this is the tenth installment in the #1 New York Times bestselling series.

The show contains moderate profanity and discussions of sensitive topics including child exploitation and trafficking, though it lacks graphic on-screen violence. Relentless by Mark Greaney (Gray Man Book 10)

The final episode deals with a shocking loss and one last search for the truth.