In the book the author looks into the mediaeval coastline, the landscape at the time, the chronicler's accounts, what the treasure consisted off, the last days of the king, possible poisoning of the king, earlier research and modern attempts to find the treasure. The author come up with a few original theories along the way.
The book contains consideration of the geographical changes in the area in question, the reclamation of the Fens, the historical context of the loss and (coincidental?) onset of the king’s terminal illness, local legends surrounding the mystery, analysis of the accounts of the chroniclers, and of earlier historians and researchers.
There is also more up to date information on local rumours, attempts by adventurers to locate the treasure and my own theories about what might have happened to it (if it were not lost in the Wash).
The book is an attempt to be the most complete source of information on the subject (which is why re-issues involve updating it and rewriting chunks of it!).