The waters of eternal youth by Donna Leon
The twenty-fifth installment in the Brunetti series set in Venice. Our Commissario finds himself drawn into investigating a fifteen year old cold case at the request of the grand Contessa Lando-Continui, a friend of Brunetti’s mother-in-law. The Contessa’s teenage granddaughter, Manuela, was found drowning in a canal. Rescued at the last moment, she suffered severe brain damage and her life was never the same again. Out of a mixture of curiosity, pity and willingness to fulfill the wishes of a loving grandmother Brunetti reopens the case. But once he starts investigating Brunetti finds a murky past and a dark story at its heart.