I remember hearing about the Denise Gigante book while she was still researching it. I happily anticipated it. I thought it a good read, but someone who isn't as "into" George Keats as I am might not have the same reaction as I did. The author, I understand, had been to the Filson Club in Louisville, KY, to use research materials there. (When I visited the Filson Club back in 2010 -- my second trip to Louisville in search of George's grave -- the staff in the archives was absolutely lovely to me, gracious and helpful. I liked that Gigante had a good bit of information about James Freeman Clarke, a close friend of George's and my favorite American Transcendentalist.
Another book that came out about the same time, "George Keats of Kentucky," was written by Lawrence Crutcher, a great-great-great-grandson of George Keats. When I started the book, I hoped to learn what really happened between George and the French/Haitian/American naturalist, John James Audubon. (It was with Audubon that George entered into that ill-fated investment that failed and caused George to return briefly to England to try to get more money.) But, LOL, in Crutcher's opinion that incident was so very confusing and poorly documented that it's unlikely anyone will ever figure out what happened.
A third book that's somewhat related -- well tangentially related, anyway -- is "The Immortal Dinner," by Penelope Hughes-Hallett, dealing with Benjamin Robert Haydon and his creation of the painting, "Christ's Entry into Jerusalem." (The painting is now in Cincinnati.)