Is there any authenticity to the book 'The Deathbed Sutra of the Buddha: Or Siddhartha's Regrets'?

I found this book in a local bookstore and went online to research it. I could not find much reference to it. The author, George C. Adams Jr., purports to have been given a lost sutra of the Buddha, given on his deathbed, to Ananda. It looks like a work of complete fiction to me but was wondering if anyone has more information on it.