I have spent a lot of the day trying to locate it, but with no luck. I have a feeling that it must have been in his book - The Cases That Haunt Us.
I have read this book, but I do not have a copy, I borrowed it from a library a few years ago.
This is what I remember. Steve Thomas claimed that the book 'Mindhunter' was found in the Ramsey home and that it contained a chapter on getting away with the perfect crime. John Douglas was apparently upset over this claim and checked the log of items removed from the house under a search warrant. No book of his was on the list.
I do not know what type of suit was brought.