Peni R. Griffin Books

Otto from otherwhere

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A ten-year-old alien boy travels through an interdimensional doorway to enter the lives of fifth grader Paula and her boisterous family for a year.

A dig in time

By Peni R. Griffin

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While spending the summer with their grandmother in San Antonio, Texas, twelve-year-old Nan and her younger brother find artifacts buried in the yard and discover how to use them to travel back thr...

Hobkin

By Peni R. Griffin

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Two sisters run away from their abusive stepfather and settle in an abandoned house in West Texas, only to find that they are not alone but share the premises with the mysterious and helpful Hobkin.

The treasure bird

By Peni R. Griffin

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A talking parrot and the rumor of buried treasure give hope to ten-year-old Jessy and her stepbrother Matt that they can save the Texas farm they have inherited from Great-Uncle Matthew.

The Brick House burglars

By Peni R. Griffin

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A group of kids from a run-down neighborhood start using an old mansion for a club house and soon discover some mysterious goings-on involving a plot to destroy the mansion for the insurance money.

Switching well

By Peni R. Griffin

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Two twelve-year-old girls in San Antonio, Texas, Ada in 1891 and Amber in 1991, switch places through a magic well and try desperately to return to their own times.

The maze

By Peni R. Griffin

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On her first visit to her father's new home, eight-year-old Caroline and her older stepbrother enter a magical painting left by one of her father's art students and find themselves trapped in a maz...

Vikki vanishes

By Peni R. Griffin

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Her habit of lying to her mother and older sister Vikki make it hard for Nikki to convince people that Vikki's recently returned father is responsible for her disappearence.

Margo's house

By Peni R. Griffin

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After her father has a serious heart attack, Margo awakes to find herself in the body of one of the dolls that he recently made for her and she desperately tries to contact her father's soul.

Switching Well

By Peni R. Griffin

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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.