Death by the light of the moon Book

Claire Malloy, bookstore owner amateur sleuth, and her 15 year old daughter Caron have been summoned to her deceased husband's home in Louisiana. They have not been there for over 10 years, but this is her former mother-in-law's 80th birthday. Miss Justica, the matriarch runs the family with an iron hand and a nasty tongue. She is confined to a wheelchair - but it is a state-of-the art motorized machine with plenty of power. She has ordered all family members to come and for "entertainment" she is going to tell people what is in her will as she celebrates her birthday. Anyone not present will be removed from the inheritance list. Miss Justica drinks too much the night before her birthday and is seen wheeling around the yard. The next morning she and the wheelchair are found in the bayou…. Did she have an accident or was it murder??? ---I didn't care much for this book. None of the characters were likeable - Even Claire wasn't very sympathetic.