Who is Hieronymus (Harry) Bosch from The Concrete Blonde and what is their importance?

A Los Angeles police detective, Harry Bosch is one of the good guys. Harry Bosch is being sued in US Court by the widow of a man who died reaching for his toupee while Bosch is trying to place him under arrest. At forty-three years of age, Harry is still in good shape. His stomach is flat, and his body still well defined and muscled. His body hair is going gray at a rate that is faster than the hair on his head, but he is not the type to let vanity determine how he looks. He has a tattoo from his tour in Vietnam, and a bullet wound scars his right shoulder.