Encyclopedia of Hadith Forgeries HB
In terms of content, knowledge, authorship, this book is outstandingly brilliant. You would never get an Arabic version of this book let alone English.
The book has had extensive study and research put into it, 10 years I believe before it has been published.
The price of the book, at 75.00 is very expensive, but if you're a collector of old valuables, which this work is, then this book can in no way be missed.