William E. Butterworth IV Books

Covert warriors

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When a hostile Third World country begins to receive military training and nuclear technology from foreign nations, Charley Castillo and his team investigate only to be abandoned by the U.S. govern...

Empire and Honor

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In the aftermath of the surrenders of Germany and Japan in October 1945, Cletus Frade and his colleagues in the OSS are given the life-threatening task of maintaining security during a covert U.S....

Broken trust

By William E. Butterworth III

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"The dramaticNew York Times-bestselling adventure in W.E.B. Griffin's Badge of Honor series about the Philadelphia police force. Having investigated his share of gruesome murders, Philadelphia Homi...

The Double Agents

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W.E.B. Griffin’s iconoclastic OSS heroes face an historic challenge in the brand-new volume of the New York Times-bestselling series. Critics and fans alike welcomed the return of the “shrewd...

Death and Honor

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June 1943. Many Germans—some of them high-ranking officers—believe the tides of war have turned against them.Increased activity suggests there may be truth to whispers heard by Office of Strategic...

The Traffickers

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Philadelphia Homicide Sergeant Matthew Payne is paired with a Texas Ranger to bring down a murderer with Mexican cartel connections. The odd couple of the Philly cop and the Texas lawman must run d...

The Honor of Spies

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August, 1943: In his short time as a spy with the Office of Strategic Services, young Cletus Frade has faced many unlikely situations, but nothing like his new assignment. Having helped Lieutenant...

The Vigilantes

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Murders are on the rise in Philadelphia-but no one seems to mind because the victims are all fugitives with histories of heinous sex crimes against women and children. Worse for Homicide Sergeant M...

The Outlaws

By Richard Hooker, William E. IV Butterworth, William E. Butterworth III

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The former Presidential Agent’s Office of Organizational Analysis has been disbanded. Charley Castillo and his colleagues have retired, and the sudden death of the President has brought an adversar...

Covert Warriors

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Charley Castillo and the former members of Presidential Agent’s Office of Organizational Analysis are officially “retired.” But that doesn’t mean they’re out of action… At a Mexican roadblock, a US...

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.