Cat Hellisen Books

Beastkeeper Turtleback School Library Binding Edition

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Trapped in a hasty marriage to lower-caste Jannik and trying to make the best of their exile, Felicita is immersed in the machinations of the powerful ruling families. MallenIve is worlds apart fro...

Empty Monsters The Books of Oreyn

By Cat Hellisen

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Learning How to Drown

By Cat Hellisen

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Empty Monsters The Books of Oreyn

By Cat Hellisen

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Shoreline of Infinity 14

By Cat Hellisen, Noel Chidwick, Ken MacLeod

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When the sea is rising red

By Cat Hellisen

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Felicita fakes her own suicide to escape from the strict confines of her aristocratic family and an arranged marriage, only to be confronted with the harsh realities of living in the slums and the...

Beastkeeper

By Cat Hellisen

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"Deep in the forest, in a crumbling ruin of a castle, Sarah begins to untangle the layers of curses affecting her family, until she discovers that the curse has carried over to her, too. The day sh...

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.