About “Relentless”
Relentless is an action thriller novel by Mark Greaney, published on February 16, 2021, by Berkley Books, and is the tenth book in the Gray Man series. It features assassin and CIA operative Court Gentry as he pursues a missing NSA agent and works to prevent a proxy conflict between Iran and the United States. The novel debuted at number four on The New York Times Best Seller list.
Book details
- First published
- 2021