The Last Wish of Ivy Ashwood. The Thistle and Hare Mysteries, #0.5

Before Clover came home, there was Ivy. And Ivy had one last mystery to solve. Ivy Ashwood is eighty-three years old, and she knows her time is running out. Not because of her aching joints or her shortness of breath on the cottage stairs, but because Bram-her faithful familiar for sixty years-has begun watching her with that particular tilt to his ears. The same way he watched her mother, and her grandmother before that.
The rabbit knows when an Ashwood is fading. But Ivy isn't ready to go. Not yet. Not until she's solved one final mystery and made peace with her greatest regret: the granddaughter she drove away. When the village postman-a man who knew everyone's secrets-dies under suspicious circumstances, Bram's nose won't stop twitching. The doctor calls it natural causes, but Ivy knows better. Someone in Bramblevine Hollow has committed the perfect murder.
And forty years ago, that postman delivered a letter that changed everything for the Ashwood family. Now Ivy must confront old enemies, older secrets, and the choices that cost her everything she loved. Because some letters should never have been sent. Some secrets should never have been kept. And some goodbyes can't wait until tomorrow. The Last Wish of Ivy Ashwood is a prequel novella to The Thistle & Hare Mysteries, featuring the woman who came before and the rabbit who remembers everything.