Katharine Kerr Books

The Spirit Stone

By Katharine Kerr

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License to Ensorcell

By Katharine Kerr

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Psychic Agent Nola O'Grady isn't sure returning to San Francisco, and living near her unusual family, is a good idea. Her job, with a psychic agency so obscure even the CIA doesn't know it exists,...

Water to Burn

By Katharine Kerr

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Just when Nola O'Grady thinks she has it all...Nola's the new head of the San Francisco branch of the Agency, the psychic organization so secret that even the CIA doesn't know it exists. What's mor...

Love on the Run

By Katharine Kerr

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Nola O’Grady is sick and tired of psychic squid-images following her everywhere, waving their tentacles and generally making nuisances of themselves. She and her partner, Ari Nathan, have a d...

Sword of Fire

By Katharine Kerr

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This first novel of an epic fantasy trilogy reintroduces readers to the beloved and bestselling world of Deverry, blending magic, politics, and adventure in an unforgettable setting.The bards are t...

Sword of Fire

By Katharine Kerr

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The Gold Falcon

By Katharine Kerr

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The Gold Falcon

By Katharine Kerr

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The Gold Falcon

By Katharine Kerr

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Experience the land of Deverry as never before in this new high fantasy romance series inspired by Celtic mythology.Reincarnated as young lovers, Nevyn and Jill test the bounds of their own ma...

The Silver Mage

By Katharine Kerr

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Read Katharine Kerr's posts on the Penguin Blog.The Horsekin are assembling along Prince Dar's northern border, and the Deverry alliance doesn't have the men or resources to prevent their enemies f...

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.