Carolyn Keene Books

Nancy Drew 07: the Clue in the Diary

By Mildred Augustine Wirt Benson, Carolyn Keene

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Nancy and her friends, George and Bess, are returning from a country carnival when they witness the explosion and burning of a beautiful country mansion. Fearing its occupants may be trapped in the...

Nancy Drew 08: Nancy's Mysterious Letter

By Carolyn Keene

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By mistake Nancy Drew receives a letter from England intended for an heiress, also named Nancy Drew. When Nancy undertakes a search for the missing young woman, it becomes obvious that a ruthless,...

Nancy Drew 10: Password to Larkspur Lane

By Carolyn Keene, Michael J. Bugeja

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Blue bells will be singing horses! This strange message, attached to the leg of a wounded homing pigeon, involves Nancy Drew in a dangerous mission. Somewhere an elderly woman is being held prisone...

Nancy Drew 11: the Clue of the Broken Locket

By Carolyn Keene, Michael J. Bugeja

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The eleventh book in the iconic Nancy Drew mystery series! Longtime fans and aspiring detectives alike will enjoy matching their wits with this beloved teenage sleuth as she works to solve the cas...

Nancy Drew 12: the Message in the Hollow Oak

By Carolyn Keene, Michael J. Bugeja

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A group of professional detectives challenge Nancy to tackle a mystery that they have failed to solve: find an invaluable message hidden by a missionary centuries ago in a hollow oak tree in Illino...

Nancy Drew 13: the Mystery of the Ivory Charm

By Carolyn Keene

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What secret life-giving power does the exquisite ivory elephant charm contain? Can the trinket really protect its wearer from all harm? Nancy Drew finds out when the owner of the Bengleton Wild-Ani...

Nancy Drew 14: the Whispering Statue

By Mildred Augustine Wirt Benson, Michael J. Bugeja

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Once again, Nancy faces two puzzling mysteries at once! The first concerns a valuable collection of rare books that Mrs. Horace Merriam commissioned anart dealer to sell--has he swindled her instea...

Nancy Drew 15: the Haunted Bridge

By Carolyn Keene, Michael J. Bugeja

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Mr. Drew is on the trail of an international ring of jewel thieves and asks Nancy to assist him. The trail leads to a summer resort area. Before Nancy has a chance to start work on her father’s cas...

Nancy Drew 16: the Clue of the Tapping Heels

By Carolyn Keene

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Challenging questions confront Nancy Drew when she attempts to solve the mystery of the strange tapping sounds in the house of a retired actress. Who is the tapper? How does he gain access to Miss...

Nancy Drew 17: Mystery of the Brass-Bound Trunk

By Carolyn Keene, Michael J. Bugeja

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From the moment Nancy Drew boards an ocean liner leaving for New York, she becomes involved in a new and dangerous mystery. A man on the pier gestures to someone on board in sign language. BEWARE...

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.