Ilse Wagner Books

The Case of the Dog Camp Mystery

By Ilse Wagner

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The Case of the Game Show Mystery

By Ilse Wagner, Jim Thomas

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The Case of the Mall Mystery

By Ilse Wagner, Alice Leonhardt

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Sisters Mary-Kate and Ashley are hired by their friend Patty to find her mother's diamond pin that was stolen at the mall.

New Adventures of Mary-Kate & Ashley 32: The Case of the Candy Cane Clue:

By Ilse Wagner, Judy Katschke

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Patty O'Leary invites all her friends, including Mary-Kate and Ashley, to a sleep over party in a toy store. When all the best toys start vanishing, the Trenchcoat Twins suspect there's an uninvite...

It's Snow Problem

By Ilse Wagner, Nancy Butcher

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Hans Jensen is tall, blond, gorgeous, and thinks he's the best at everything. When he signs up for every ski race in the White Oak/Harrington Winter Festival, Mary-Kate does too. Then Mary-Kate g...

Shore Thing

By Ilse Wagner, Judy Katschke

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Two for the Road

By Ilse Wagner, Nancy Butcher

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While in Florida on their school trip, Mary-Kate searches for her lost diary and Ashley worries about competition from Dana Woletsky.

Two of a Kind 21: Now You See Him, Now You Don't

By Ilse Wagner, Megan Stine

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"Mary-Kate and Ashley have great tricks ready for the Harrigton magic show. They're sure to be a hit! But before show time, Ashley's partner leaves her trapped in a box and Mary-Kate's mind-reading...

Island Girls

By Ilse Wagner, Nancy Butcher

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Two of a Kind 24: Surf, Sand, and Secrets

By Ilse Wagner, Nancy Butcher

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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.