Who is Guido Brunetti from Death and Judgment and what is their importance?

Guido Brunetti is the commissario of the Venice police. Brunetti has been on the job for a number of years and is somewhat jaded by the politics involved in the work. These politics involve mutual dislike between Brunetti and his boss, Vice Questore Patta. It is clear Patta does not respect Brunetti nor approve of his methods but Brunetti's service record is a valid testament to his honor.