At a fundraising dinner for a Venetian charity, a wealthy and aristocratic patroness asks Brunetti if he will investigate the fifteen-year-old attempted drowning of her granddaughter, which left the girl irreparably brain damaged. Brunetti's not sure what to do, but out of a mixture of curiosity, pity, and a willingness to fulfill the wishes of a guilt-wracked older woman, who happens to be his mother-in-law's best friend, he agrees.