As a favour to his wealthy father-in-law, the Count Falier, Commissario Guido Brunetti agrees to investigate the seemingly innocent wish of the Count’s best friend, the elderly and childless Gonzalo, to adopt a younger man as his son. Under Italian inheritance laws, this man would become the sole heir to Gonzalo’s substantial fortune, something which Gonzalo’s friends, including the Count, find appalling. For his part, Brunetti wonders why they’re so intent on meddling in the old man’s business....