The Beach House by James Patterson

Jack Mullen is a driven student of the law. His brother Peter is a servant of the rich, parking the cars of the Hamptons' elite --- and perhaps satisfying their more intimate needs as well. Then Peter's body is found on the beach. Jack knows the drowning was no accident, but someone's unlimited power and money have bought the cops, the judges, the system. Now Jack is learning a lesson in justice he never got in law school ... and his astonishing plan to beat the billionaires will have you reeling --- and cheering --- to the very last page.