Edmund: the Untold Story of the Martyr-King and His Kingdom by Mark Taylor is a recently released book available as an ebook in the States and in the UK. However, there is a special limited edition book in the UK which apparently contains additional and updated information than either ebook. For those interested in the intersection of esotericism, history and the physical landscape, especially the occult landscape, this may be of particular interest.

This book seems particularly tied to the work of the publisher Fodaro who say they publish “popular history, folklore, esoterica and mythology content across digital and traditional platforms” and so far offer a Secret Suffolk website, Secret York iOS mobile app and the book Edmund.
“Edmund, Anglo-Saxon king of the East Angles, was murdered by the Danes aged only 29 years. He was declared England’s patron saint 20 years later and worshipped by the Danes who killed him. Attended by royalty and honoured as far north as Iceland, he was renowned for his miracles of fertility and protection. But his martyrdom was unrecognised for 250 years. Why?
For the first time, this fascinating book reveals the secrets behind Edmund’s life and death. It explains why Edmund was venerated as a sacred king who, in death, guaranteed prosperity to his kingdom; how he represented the mysterious bond between god, king and land; how he united Saxon and Viking, pagan and Christian; and how he became a divine guardian in the tradition of other English national heroes.
If there was still any debate over whether Edmund should be reinstated as England’s patron saint, this book settles the argument once and for all!
Containing a wealth of information, including vivid photographs and detailed maps, this book is sure to be of interest to anyone with an interest in Celtic, Anglo-Saxon and Norse culture and belief, paganism and early Christianity, Suffolk and East Anglian history, mythology and folklore.” [via]
“Many people are familiar with the basic story of Edmund’s martyrdom: Vikings, an oak tree, arrows, decapitation, a sentinel wolf. Yet there is much more to his legend, and the story of Suffolk, than is commonly told. This fascinating book reveals for the first time the secrets of both Edmund the sacrificial warrior-king and the sacred land he ruled over. It confirm his true significance, and his status as a divine sentinel-king in the tradition of other national heroes.
Edmund: The Untold Story of the Martyr-King and his Kingdom, contains a wealth of insights, including:
The hidden symbolism of Edmund’s martyrdom
Why the cult of St Edmund grew rapidly amongst both Christians and pagans
How Edmund embodied ancient concepts of sacred kingship
How, as king, he was explicitly linked to the welfare of the land
How Edmund’s kingly qualities are embedded in places throughout East Anglia
Why the town of Bury St Edmunds was constructed according to symbolic principles
Its pre-Anglo-Saxon origins
How Bury conforms to ideas of a mythic hero’s resting-place” [via]