This book turned out to be a fascinating rabbit hole.
I knew very little about Austin Osman Spare other than he was a revered surrealist artist and influential magician [of the "occult" type, not the "theatrical" type]. I have an affinity for genius weirdos, so the legend of Spare caught my attention. Intrigued, I requested this book through my library with no other information than the title.
Spare apparently created a hand-made Tarot deck for his own use in c.1906. He never seems to have mentioned the deck as he drifted from Tarot fandom shortly thereafter and the deck was eventually given/sold by Spare to The Magic Circle, a British society and museum for magicians [of the "theatrical" type, not the "occult" type]. The Magic Circle considered the deck to be not much more than a curiosity and the deck sat in their vaults, untouched for decades.
By the time the deck was rediscovered in 2013, Spare's renown [he died in 1956] among artists and esotericists had grown greatly. The deck is far more than a DIY item made by a fringe misfit over 100 years ago, however, and this book delves into the many reasons Spare's Tarot deck is important and worthy of study and display.
Not only are each of the cards a unique art piece by Spare, but his inclusion of his own innovative features, such as marginal drawings that are only completed when two cards are placed side-by-side and his written interpretations on each card face [a kind of reference guide built into the deck] make this unlike any Tarot deck before or, likely, since.
The Who/What/When/Where/Why around the deck's creation add many layers to the story which give weight to this bizarre and unique divination deck.
This book is written and published by people who clearly have an admiration for the talented oddball that Spare was. It's well-researched, including an analysis of the provenance [the chain of custody for an art piece] of the deck and a thorough analysis of every detail Spare included in his personal deck.
It turns out that a book about one deck of cards was incredibly interesting.