Renoir 
The Fall of De Wilde [EPUB ebook] 

There’s a suspicious death in Golden Gardens Retirement Estate. Is there a murderer stalking the Estate, or is someone outside bearing a deadly grudge? The police have a suspect, but Cianawyn Lauder and her mother have suspicions of their own. The chief detective doesn’t think much of amateur sleuths, or of 'senior citizens’ in general, but with age comes wisdom. Shrewd investigative work. And maybe a more cunning killer.