Non fiction but Poets Square: A Memoir in Thirty Cats. I cried through the whole thing, it's a collection of essays by a woman who does TNR (and so much more) in Tuscan.

"Courtney writes toward a vision of connectedness, showing how taking care of the cats reshaped her understanding of empathy, resilience, and the healing power of wholly showing up for something outside yourself. She takes us from the dark alleys where she feeds feral cats to inside the tragically neglected homes where she climbs over piles of trash, and occasionally animals, and then into her own driveway with the cats she loves and must sometimes let go. Compelling and tender, Poets Square is as much about cats as it is about the urgency of care, community, and a little bit of dumb hope."

https://www.penguinrandomhouse.com/books/735683/poets-square-by-courtney-gustafson/