Johan Theorin Books

Twenty years after Jens disappeared without a trace from the island of Oland, a package is mailed to the boy's grandfather that contains the worn and mended shoe of a child, prompting the grandfath...

The Darkest Room

By Johan Theorin

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WINNER OF SWEDEN’S BEST CRIME NOVEL AWARDOn the idyllic island of Öland, off the coast of northern Sweden, a young couple from Stockholm tries to start life afresh. For Joakim and Katrine Westin, r...

The Darkest Room

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Echoes from the Dead

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On a gray September day, on an island off the coast of Sweden, six -year -old Jens Davidsson ventured out of his backyard, walked out into a fog, and vanished….Now twenty years have passed, and in...

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.