Carolyn Keene Books

Nancy Drew 42: the Phantom of Pine Hill

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When Nancy Drew and her two close friends arrive for the Emerson University June Week celebration and learn there has been a mix-up in their motel reservations, the confusion leads to a baffling my...

Nancy Drew 43: the Mystery of the 99 Steps

By Carolyn Keene, Michael J. Bugeja

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Nancy Drew must search for a flight of 99 steps to solve the mystery of a friend’s weird dream. Her search leads her to France, but before she leaves the United States, an unknown person calling hi...

Nancy Drew 44: the Clue in the Crossword Cipher

By Carolyn Keene

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Lovely young Carla Ponce, who lives in Peru, invites Nancy and her friends Bess and George to visit her and solve her “monkey mystery,” which promises to lead to a fabulous treasure. A clue is carv...

Nancy Drew 45: the Spider Sapphire Mystery

By Carolyn Keene, Michael J. Bugeja

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Thrilling, dangerous adventures confront Nancy Drew while on a safari in East Africa with a group of American college students. Excitement runs high as the teen-age detective delves into the theft...

Nancy Drew 46: the Invisible Intruder

By Carolyn Keene

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“Nancy Drew, forget the ghost hunt!” a male voice rasps on the telephone. Despite the mysterious warning, the teenage detective and a group of friends start out on a ghost-hunting expedition to inv...

Nancy Drew 47: the Mysterious Mannequin

By Michael J. Bugeja

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The strange disappearance of a young Turkish client of Mr. Drew’s and the gift of an Oriental rug with a coded message woven into its decorative border start Nancy on a difficult search for a missi...

Nancy Drew 48: the Crooked Banister

By Carolyn Keene

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Nancy and her friends Bess and George spend an exciting week exploring a mysterious zigzag house with its fantastically crooked staircase, its bizarre serpent picture, and an unpredictable robot th...

Nancy Drew 49: the Secret of Mirror Bay

By Carolyn Keene

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Aunt Eloise Drew invited Nancy and her friends to Mirror Bay Bide-a-Wee cabin near Cooperstown, New York, for a visit and a chance to solve the mystery of the woman who glides across the water. Upo...

Nancy Drew 51: Mystery of the Glowing Eye

By Carolyn Keene

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When Nancy Drew eagerly agrees to help her lawyer father solve the mystery of the glowing eye, she has no way of knowing that it will involve the kidnapping of her close friend Ned Nickerson. A puz...

Nancy Drew 52: the Secret of the Forgotten City

By Carolyn Keene, Michael J. Bugeja

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Gold! There are rumors that long ago a treasure was hidden in a city now buried under the Nevada desert. Nancy and her friends plan to join a dig sponsored by two colleges to hunt for the gold. Bef...

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.