Christopher Valen Books

The black minute

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The body of a young woman is found on Harriet Island near the Mississippi River. It appears to be a simple case of murder and revenge. But what begins as a routine investigation for St. Paul Police...

Death s way

By Christopher Valen

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The death of a beautiful escort in a downtown hotel room appears to be a case of autoerotic asphyxiation gone wrong. But when a woman brings her young daughter to the police department with a stran...

Speak For The Dead

By Christopher Valen

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All The Fields

By Christopher Valen

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White tombs

By Christopher Valen

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John Santana of the St. Paul Police Department police procedural provides enough plot twists to keep readers engrossed and paints a clear picture of St. Paul's Hispanic community.

Bad Weeds Never Die A John Santana Novel

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The black minute

By Christopher Valen

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Bone shadows

By Christopher Valen

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"The bodies of young men have been turning up in the Mississippi River for years, their deaths attributed to excessive drinking. But when an Iraq was vet suffering from PTSD is found in the river,...

Darkness Hunter

By Christopher Valen

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City of Stones

By Dan Cohen, Christopher Valen

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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.