James Thurber was a noted author and playwright from the first half of last century who, amongst other noted works, was the author of "The Secret Life of Walter Mitty". In the 1964 edition of his anthology, "Alarms and Diversions", he devotes one chapter to the Loch Ness Monster entitled "There's Something Out There!".
This was after what he calls a two year search for the monster, which certainly involved a trip to Loch Ness and trawling through the Daily Mail archives, though what else he got up to in that time is not certain. Thurber devotes 15 pages to the monster as he recounts his own experiences and gives us a potted history of the creature and its pursuers for your interest from page 60 onwards.
Thurber's book is typical of many books out there, which though not a book devoted to the subject, will divert from the normal news and events of their world to talk about the monster. I have a few in mind, perhaps I will get round to putting them out there.
I have a PDF copy of the book which can be accessed here.
The author can be contacted at firstname.lastname@example.org