Mark Greaney Books

Sierra Six

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It's been years since the Gray Man's first mission, but the trouble's just getting started in the latest entry in the #1 New York Times bestselling series.Before he was the Gray Man, Court Gentry w...

The Gray Man

By Mark Greaney

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Relentless

By Mark Greaney

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Armored

By Mark Greaney

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Armored

By Mark Greaney

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A novel inspired by #1 New York Times best-selling author Mark Greaney’s Audible Original drama, Armored.Joshua Duffy is a Close Protection Agent—a professional bodyguard—and he's...

Sierra Six

By Mark Greaney

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Armored

By Mark Greaney, Adam Gold

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Tom Clancy

By Mark Greaney

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Tom Clancy Commander in Chief

By Mark Greaney

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This electrifying thriller in the #1 New York Times bestselling series has President Jack Ryan and his allies facing a treacherous foe threatening to unleash chaos around the globe...When Russ...

Tom Clancy s full force and effect

By Mark Greaney

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A North Korean ICBM crashes into the Sea of Japan. A veteran CIA officer is murdered in Ho Chi Minh City, and a package of forged documents goes missing. The pieces are there, but assembling the pu...

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.