I just saw that Nick Redfern's book, "Nessie: Exploring the Supernatural Origins of the Loch Ness Monster", has appeared on Amazon with a publication date of September 8th, 2016. I note the American site offers kindle and paperback versions, while the British site offers only kindle. I am sure that will change over time.
As an aside, I noticed Nick's book was categorized under "Religion & Spirituality" while the more biographical book "A Monstrous Commotion" was filed under "Social Sciences/Anthropology". It seems the subject of the Loch Ness Monster covers a plethora of disciplines.
BTW, is there a difference between "supernatural" and "paranormal"?
This also prompted me to produce this graph, it is the number of books and booklets published exclusively on the Loch Ness Monster or with a good part devoted to it since the 1930s on a decade basis. It is based on the list I maintain here but does not include reprints and revisions.
Not surprisingly, the 1970s was the top decade, boasting 23 publications with the 1980s second with 14. However, this decade looks set to grab second place with a current projected total of 10 going into this year and with another three years to go. The projections suggests we could end up with 16 books by the end of 2019. Perhaps this is not so surprising in this age of online self-publishing. Mind you, the 1970s had its fair share of tatty tourist booklets and boilerplate books.