Commissario Guido Brunetti - The main protagonist, a Venetian police inspector investigating the apparent suicide of a young cadet at a prestigious military academy. Brunetti is portrayed as a caring family man who is deeply affected by the case since his own son is around the same age as the victim. He is determined to uncover the truth despite facing obstruction from powerful figures.

Dr. Moro - The father of the deceased cadet, Ernesto Moro. A former politician known for his integrity, Dr. Moro is initially uncooperative with Brunetti's investigation, fueling suspicions that his son's death may be linked to his past political career and a report he prepared exposing corruption.

Signorina Elettra - The computer expert at the Questura who assists Brunetti in his investigations, using her technological skills to uncover clues and information.

Ernesto Moro - The 16-year-old cadet whose apparent suicide at the military academy sets the plot in motion. His death deeply affects Brunetti, who sees parallels with his own teenage son.

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