Paul Christopher Books

Spies Must Die

By Paul Christopher, Christopher Paul.

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The Aztec Heresy

By Paul Christopher, Christopher, Paul., Christopher, Paul., Paul Christopher

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An ancient secret. A lost city. A treasure that could change the world. In search of a Spanish galleon in the Caribbean, archaeologist Finn Ryan and her partner Lord Billy Pilgrim find evidence of...

The Templar Cross

By Paul Christopher, Christopher Paul

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From the USA Today Bestselling author of The Sword of the Templars and The Aztec Heresy Some secrets are too great to bear... Retired Army Ranger Lt. Col. John Holliday has reluctantly settled...

The Templar Conspiracy

By Paul Christopher

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"In Rome, the public assassination of the Pope by a sniper on Christmas Day sets off a massive investigation that stretches across the globe. But behind the veil of Rex Deus--the Templar cabal that...

Red Templar

By Paul Christopher

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After nearly losing his life in Africa, retired Army Ranger and historian John Holliday is ready for some R&R back in the U.S. But when a disheveled Russian called Genrikhovich intercepts him in th...

Michelangelo'S Notebook

By Paul Christopher, Christopher Paul, Christopher, Paul.

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Life may imitate art...but death follows it. While studying art history at New York University, brilliant and beautiful Finn Ryan makes a startling discovery: a Michelangelo drawing of a dissected...

The Lucifer Gospel

By Paul Christopher, Christopher, Paul.

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Young archaeologist Finn Ryan and charismatic pilot and photographer Virgil Hilts are scouring the Sahara for the long-lost tomb of an apostle. But they find something they weren’t looking for: sig...

Secrets Of The Templars

By Paul Christopher

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John Holliday, army ranger turned historian, is the Indiana Jones of conspiracy thrillers. Ex-army ranger turned historian John Holliday is in search for the truth behind the ancient and deadly Tem...

The Sword Of The Templars

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The Templar cross

By Paul Christopher

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Retired Army Ranger John Holliday has reluctantly settled into his teaching position at West Point, when young Israeli archaeologist Rafi Wanounou comes to him with desperate news. Holliday's niece...

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.