When one of his wife's Paola's students comes to visit him, with a strange and vague interest in investigating the possibility of a pardon for a crime committed by her grandfather many years ago, Commissario Brunetti thinks little of it. But when the girl is found dead, clearly stabbed to death, Claudia Leonardo suddenly becomes Brunetti's case, no longer Paola's student. Claudia seems to have no discernible living family - her only familial relationship...