Published in 1991 when it was more difficult to see some of Fisher's films, this book makes a good case for Fisher as one of the essential creators of the Hammer horror style and as a filmmaker with certain preoccupations which may qualify him as an 'auteur' in the eyes of some (although I found this argument less convincing when applied to the pre-'Curse of Frankenstein' films). Some of Fisher's films are dealt with in a mere paragraph or two, while others are examined in exhaustive detail with pages and pages of synopsis. For this reason, I skim read a lot of it.
The author interviewed Fisher's widow at some length, which does provide some insight into the man, but other interviews are few and far between. There is very little in the way of behind-the-scenes anecdotes, so anyone hoping for that is likely to be disappointed, but this is worth reading if looking for a well-written and detailed analysis of the major films (and a few lesser-known ones). In 2017, the author published a revised version entitled 'The Films of Terence Fisher - Hammer Horror and Beyond', so it's probably better to seek that one out.