Mark Greaney Books

Tom Clancy Support and Defend

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Over the course of three decades, Tom Clancy created a world alive with prescient action and remarkable individuals. In Tom Clancy Support and Defend, covert agent Dominic Caruso faces the deadlies...

Back Blast

By Mark Greaney

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From Mark Greaney, the #1 New York Times bestselling coauthor of Tom Clancy’s Jack Ryan novels, comes the fifth explosive thriller featuring the lethal assassin known as the Gray Man… Five years a...

Gunmetal Gray

By Mark Greaney

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THE NEW YORK TIMES BESTSELLER!Mark Greaney, the #1 New York Times bestselling coauthor of Tom Clancy’s Jack Ryan novels, delivers another breakneck thriller following the world’s deadliest assassin...

Locked On

By Mark Greaney, Tom Clancy

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Jack Ryan Jr.—along with the covert warriors of the Campus—continues to uphold his legendary father’s legacy of courage and honor in this thriller from #1 New York Times bestselling author Tom Clan...

Dead Eye

By Mark Greaney

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Ex-CIA master assassin Court Gentry gets hit with a blast from the past in the fourth Gray Man novel from #1 New York Times bestselling author Mark Greaney.Court Gentry has always prided himself on...

Ballistic

By Mark Greaney

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#1 New York Times bestselling author Mark Greaney presents the third Gray Man novel, featuring the ex-CIA assassin being hailed as “Bourne for the new millennium” (James Rollins).After Court Gentry...

Agent in Place

By Mark Greaney

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From Mark Greaney, the New York Times bestselling author of Sierra Six and the coauthor of Tom Clancy's Jack Ryan novels, comes a high-stakes thriller featuring the world's most dangerous assassin:...

Mission Critical

By Mark Greaney

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THE NEW YORK TIMES BESTSELLER From Mark Greaney, the New York Times bestselling author of Gunmetal Gray and a coauthor of Tom Clancy's Jack Ryan novels, comes a high-stakes thriller featuring the w...

Mission Critical

By Mark Greaney

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Agent in place

By Mark Greaney

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"The Gray Man is back in another nonstop international thriller from #1 New York Times bestselling coauthor of Tom Clancy's Jack Ryan novels Court Gentry is back in action. This time he's working o...

How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.