In this 25th novel in Donna Leon's Commissario Guido Brunetti series, Brunetti accepts the request of an elderly woman to investigate an incident that occurred fifteen years ago. An incident that left her granddaughter, now in her thirties, with the mind of a child, Brunetti calls upon the skills and resources of his colleagues, and struggles with his own emotions as a parent. 
 The book is well-written and the tension builds until the last few pages. I recommend it highly.