Carolyn Keene Books

Nancy Drew 18: Mystery of the Moss-Covered Mansion

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A friend of Carson Drew’s has been arrested and charged with sending a truck loaded with explosive oranges into the Space Center complex at Cape Kennedy. Knowing that Mr. Billington could not possi...

Nancy Drew 19: the Quest of the Missing Map

By Mildred Augustine Wirt Benson

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Prompted by the concerns of a young child, Nancy investigates a small studio on the Chatham estate. She discovers that there is a connection between the mysterious occurrences at Ship Cottage and h...

Nancy Drew 20: the Clue in the Jewel Box

By Carolyn Keene

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An antique dealer’s revelation about a former queen’s priceless heirloom starts Nancy on a trail of exciting adventures. Madame Alexandra, now living incognito in River Heights, asks Nancy to find...

Nancy Drew 21: the Secret in the Old Attic

By Carolyn Keene

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Nancy Drew races against time to unravel the clues in a dead man’s letters. If she succeeds, Philip March and his little granddaughter can be saved from financial ruin. Following obscure clues, Nan...

Nancy Drew 22: the Clue in the Crumbling Wall

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When Nancy is asked to find a professional dancer who disappeared several years before, the young detective becomes involved in a mystery reaching far beyond a missing-person’s case. During Nancy’s...

Nancy Drew 23: Mystery of the Tolling Bell

By Carolyn Keene, Michael J. Bugeja

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Nancy becomes involved in another mystery when she accepts an invitation from Mrs. Chantrey, a client of Mr. Drew, to vacation at her cottage in a picturesque seaside town. Carson Drew has promised...

Nancy Drew 24: the Clue in the Old Album

By Mildred Augustine Wirt Benson, Carolyn Keene, Michael J. Bugeja

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Nancy Drew witnesses a purse snatching and runs after the thief. She rescues the purse, but not its contents, then is asked by the owner, a doll collector, to do some detective work. Readers will e...

Nancy Drew 26: the Clue of the Leaning Chimney

By Carolyn Keene, Michael J. Bugeja

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Nancy Drew and her friend Bess discover that a rare and valuable Chinese vase has been stolen from the pottery shop of Dick Milton, a cousin of Bess. Dick had borrowed the vase from his Chinese fri...

Nancy Drew 27: the Secret of the Wooden Lady

By Carolyn Keene

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Adventure abounds on the Bonny Scot in Boston Harbor as Nancy Drew helps Captain Easterly uncover the mystery of his ghostly visitors. From the moment the clever young detective and her friends, Be...

Nancy Drew 28: the Clue of the Black Keys

By Wilhelmina Rankin

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Terry Scott, a young archaeology professor, seeks Nancy’s help in unearthing a secret of antiquity which can only be unlocked by three black keys. While on an archaeological expedition in Mexico, T...

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.