Many of the cases within this book have never been written about outside of the original newspaper reports.
Welsh author Gary Dobbs is best known as a fiction writer. Using the pen name Jack Martin, he is responsible for a string of best-selling westerns as well as the popular crime series, Granny Smith. The latter was published under his own name. Dark Valleys is his second major non-fiction work following the successful Cardiff and the Valleys in the Great War, which was also published by Pen & Sword. Hours of research were involved in compiling the stories presented within these pages, and alongside the harrowing tales of often-brutal violence, the author feels there is a very human story that reflects the respective times and societies that spawned these terrible events.