Margaret Duffy Books

Tainted Ground Ingrid Langley and Patrick Gillard Mysteries

By Margaret Duffy

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Cobweb Gillard Langley

By Margaret Duffy

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Blood Substitute

By Margaret Duffy

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Tainted Ground

By Margaret Duffy

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Cobweb

By Margaret Duffy

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When a DCI is killed in a car crash, his superiors are convinced he was silenced because he was investigating the murder of MP Jason Giddings. Patrick Gillard and his consultant (and wife) Ingrid L...

Souvenirs of Murder

By Margaret Duffy

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Stealth

By Margaret Duffy

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Working part-time for the Serious Organized Crime Agency at the side of her former MI5 agent husband, crime author Ingrid Langley uses her literary contacts to investigate the activities of a fello...

Ashes to ashes

By Margaret Duffy

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Currently on leave, Patrick Gillard is considering whether to carry on his hazardous job as 'adviser' to the National Crime Agency when his father, the local rector, asks for his help. A local woma...

Stone Cold Stone Dead

By Margaret Duffy

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Stealth

By Margaret Duffy

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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.