Roy Johansen Books

Sight Unseen

By Iris Johansen, Roy Johansen

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The naked eye

By Iris Johansen

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"Kendra Michaels was instrumental in bringing serial killer Eric Colby to justice. And yet, despite his apparent execution at San Quentin, Kendra is convinced that Colby is still alive and framing...

More Than Meets the Eye

By Elisabeth Rodgers, Roy Johansen, Iris Johansen

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Look behind you

By Iris Johansen

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"A serial killer in San Diego near Kendra Michaels' home and office leaves behind objects are actually souvenirs of other unsolved serial murder cases in various U.S. cities and features characteri...

Double blind

By Iris Johansen

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"When a young woman dies trying to get a video of a wedding reception to Kendra Michaels, the FBI seeks Kendra's help. As the body count rises, Kendra joins forces with private investigator Jessie...

Beyond Belief

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Deadly Visions

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Close your eyes

By Iris Johansen

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Silent thunder

By Iris Johansen

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When her brother is killed, brilliant marine architect Hannah Bryson must discover the volatile mystery behind a decommissioned Soviet submarine, Silent Thunder, that was recently purchased by the...

Storm cycle

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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.