Carolyn Keene Books

Nancy Drew 29: Mystery at the Ski Jump

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When Nancy learns that the Drews’ housekeeper has been duped by an elegantly dressed woman into buying a stolen fur piece, the young detective starts a search for the clever swindler. To Nancy’s as...

Nancy Drew 31: the Ringmaster's Secret

By Michael J. Bugeja

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Nancy is given a beautiful gold bracelet and finds that one of the charms is missing. When she learns the unusual story behind the jewelry, she sets out to solve the fascinating mystery. The bracel...

Nancy Drew 32: the Scarlet Slipper Mystery

By Carolyn Keene

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Nancy meets Helene and Henri Fontaine, refugees from Centorvia who run a dancing school in River Heights. Strange circumstances have brought the brother and sister to the United States. When they r...

Nancy Drew 33: The Witch Tree Symbol

By Carolyn Keene, Michael J. Bugeja

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When a neighbor asks Nancy Drew to accompany her to an old uninhabited mansion, a new mystery opens ups, and danger lurks on the second floor. Nancy finds a witch tree symbol that leads her to Penn...

Nancy Drew 35: the Haunted Showboat

By Carolyn Keene, Michael J. Bugeja

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Bess and George invite Nancy on a trip to New Orleans, to help their relatives solve a mystery. Their uncle wants to restore an old showboat, the River Princess, but no one will go near it! Mysteri...

Nancy Drew 36: The Secret of the Golden Pavillion

By Carolyn Keene

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One of Mr. Drew's new clients, Mr. Sakamaki, requests Nancy's help solving a mystery. Mr. Sakamaki recently inherited his grandfather's estate in Hawaii, but two strangers arrive, claiming to also...

Nancy Drew 37: the Clue in the Old Stagecoach

By Carolyn Keene

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Mrs. Strook requests Nancy's help finding an old stagecoach she believes her uncle hid in her hometown of Francisville. Mrs. Strook believes the stagecoach houses a clue that will be valuable for t...

Nancy Drew 38: the Mystery of the Fire Dragon

By Michael J. Bugeja

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Nancy receives an urgent call from her Aunt Eloise in New York, requesting her help in solving a mystery. Her neighbor's granddaughter, Chi Che Soong, has gone missing! Nancy and her friends fly to...

Nancy Drew 39: the Clue of the Dancing Puppet

By Carolyn Keene

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When the eerie performances of a life-size puppet begin to haunt the old Van Pelt estate, where an amateur acting group – The Footlighters – have their theater, Nancy Drew is called upon to unravel...

Nancy Drew 41: the Clue of the Whistling Bagpipes

By Carolyn Keene

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Warnings not to go to Scotland can’t stop Nancy Drew from setting out on a thrill-packed mystery adventure. Undaunted by the vicious threats, the young detective – with her father and her two close...

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.