# Relentless

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![Relentless](https://quivercdn.com/covers/berkley/mark-greaney/relentless_978-05-9309-897-4.jpg?v=2026-06-05%2002%3A36%3A27)

- Book: [Relentless](https://www.bookquiver.com/mark-greaney/relentless) ([Relentless.md](https://www.bookquiver.com/mark-greaney/relentless.md))
- Authors: [Mark Greaney](https://www.bookquiver.com/mark-greaney)
- Publisher: Berkley
- ISBN: 978-05-9309-897-4
- Pages: 528
- Published: 2021-08-03
- Language: en_US
- Binding: Softcover

## Description

The Gray Man's search for missing intelligence agents plunges him deep into a maelstrom of trouble in the latest entry in the #1 New York Times bestselling series. The first agent disappearance was a...