Playing Dead, by Julia Heaberlin

After receiving a letter from a woman claiming to be her real mother, Tommie McCloud returns home to Ponder, Texas.  With her father recently dead and her mother's dementia having stolen her memories and personality, Tommie has a difficult time unravelling the mysteries that emanate from this troubling letter.  Luckily she has help from her sister Sadie, her niece Maddie, her old boyfriend, and a small troupe of good old boy (and girl) Texas characters.  If you read this book at a dead run, as it almost demands to be read, you miss the little inconsistencies and failures to compute that start niggling after you're done.  But also lingering are fascinating bits about equine therapy and wind farming.