---
title: "Relentless"
author: "Mark Greaney"
genre: "Mystery & Thriller, Espionage"
category: "Fiction"
themes: "Action/Suspense;Intelligence World Critiques;Personal Resilience/Endurance;Conspiracy/Stalking"
isbn_13: "9780593098967"
isbn_10: "059309896X"
asin: "0593098951"
amazon_link: "https://www.amazon.com/Relentless-Gray-Man-Mark-Greaney/dp/0593098951"
bookshop_link: "https://bookshop.org/p/books/fatal-measure-a-codi-sanders-thriller-brent-ladd/699d5701dbab1a51"
source_url: "https://marciebooks.co/?search=Relentless"
data_license: "CC BY-NC 4.0"
---

# Relentless

## Context
Marcie Books is dedicated to improving author discovery. We focus on showcasing experienced authors who have mastered their craft and gained reader appreciation. marciebooks.co is a data feature of marcie.app where writers can do more of what they love. Write!