Mary Sangiovanni Books

Behind the Door

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Occult specialist Kathy Ryan returns in this thrilling novel of paranormal horror from Mary SanGiovanni, the author of Chills . . .   Some doors should never be opened . . .   In the rura...

Chills

By Mary SanGiovanni

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Under Cover of Night

By Mary Sangiovanni

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The Hollower

By Mary Sangiovanni

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The Hollower

By Mary Sangiovanni

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Beyond the Gate

By Mary SanGiovanni

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Kathy Ryan’s work as an occult investigator often leads her to the outskirts of society, law, and even reality... Knowing that other dimensions exist is one thing. Venturing into them is quit...

Alien: Enemy of My Enemy

By Mary SanGiovanni

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While a moon hurtles toward certain destruction, taking with it a Weyland-Yutani bioweapons lab, talks on a nearby colony could lead to all-out war among the colonies.HYGIEIA—AN OUTER RIM COL...

My Favorite Story Podcast Author Anthology

By Frank J. Edler, Chuck Buda, Brian Keene, Jonathan Maberry, Armand Rosamilia, Christopher Golden, Mary SanGiovanni, Kelli Owen, James A. Moore, Jay Wilburn

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Okiku

By Mary SanGiovanni

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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.