Mark Greaney Books

Command authority

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There's a new strong man in Russia but his rise to power is based on a dark secret hidden decades in the past. The solution to that mystery lies with a most unexpected source, President Jack Ryan....

The Gray Man

By Mark Greaney

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THE FIRST GRAY MAN NOVEL FROM #1 NEW YORK TIMES BESTSELLING AUTHOR MARK GREANEY—Now a Netflix Film Starring Ryan Gosling and Chris Evans“Hard, fast, and unflinching—exactly what a...

Tom Clancy Commander in Chief

By Mark Greaney

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This electrifying thriller in Tom Clancy's #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...

Tom Clancy True Faith and Allegiance

By Mark Greaney

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President Jack Ryan deals with the worst breach U.S. intelligence has ever suffered in this “compelling and frighteningly realistic”* thriller in Tom Clancy’s #1 New York Tim...

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.