I have two additional authors to suggest: Michael Connelly and his character Harry Bosch, a LAPD police detective who has to track down crimes and deal with administrative politics at the same time; and Lee Child with his invention Jack Reacher, a man who lives on the street and by his wits, a former Army MP who manages to get imbroiled in various escapades and uses his unconformed approach and manner to solve those problems.
Thanks for the suggestions, Jay; I'll check 'em out.