The back cover explains what the book does:
We do no more than present to you the facts. We give you the evidence. We pose the questions. Only you, the reader, can provide the answers.
Among the many mysteries, the book describes the life of the great seer Mother Shipton, who lived in Knaresborough, only 15 miles from Otley.
She must have been a supreme fortune teller, for not only could she see into the future, she could also see The Past. The French had already lost the Battle of Agincourt 73 years before her birth.
Sometimes the book comes closer to solving mysteries than the authors themselves realise, such as when they search for possible reasons for the Hindenburg disaster.
The vessel had a proud record to live up to ... and the safety standards were of the highest.
What could be the reason for the airship bursting into flames? The picture editor seems to have laid his finger on the problem. His caption below a big picture of the airship explains:
The Hindenburg. It was 245 metres long and contained 198 000 cubic metres of inflammable hydrogen.
More seriously, the authors have picked some genuinely interesting unsolved mysteries, and the cause for the Hindenburg igniting is still debated. They also have included many great pictures and there aren't many factual inaccuracies. There is, however, a lot of suggestion, and a distinct lack of respect for Occam's Razer.