Martin Widmark Books

The gold mystery Martin Widmark illustrated by Helena Willis

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"When a valuable shipment of gold disappears from the vault at the Pleasant Valley bank, Jerry and Maya are called in to help crack the case. There are no witnesses and there's nothing on the secur...

Whodunit Detective Agency 8 Copy CD W Riser

By Martin Widmark

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The swimming pool mystery

By Martin Widmark

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It s Christmastime in Pleasant Valley and the town is getting ready to celebrate. But when all the lockers at the Pleasant Valley swimming pool are emptied during the Big Holiday Swim, it looks lik...

The movie theater mystery

By Martin Widmark

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Doodle Bug is the third dog that has mysteriously disappeared in Pleasant Valley. But the police chief has no idea who the dog-napper might be. When Jerry and Maya hear strange sounds coming from t...

The mummy mystery

By Martin Widmark

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What's going on at the art museum in Pleasant Valley? Did the Egyptian mummy really come to life after 3,000 years? The terrified night watchman claims that he saw the mummy walking around the muse...

The house of lost and found

By Martin Widmark

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Niles lives alone in a big house full of dust and memories of the people he s lost. Then one day, the boy from next door asks Niles to look after his plant. Reluctantly, Niles takes the pot of dirt...

Leo Maya Detectives tome 4 Mystere au camping

By Frederic Fourreau, Helena Willis, Martin Widmark

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Leo Maya detectives tome 5 Le mystere des lingots d or

By Frederic Fourreau, Helena Willis, Martin Widmark

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Mystere a l ecole

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Oskar et Malena Detectives prives French Edition

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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.