Production has begun on the fourth season of the Boston-set police drama series \"Rizzoli & Isles,\" TNT announced Friday. The cable television network said it has ordered 15 episodes for Season 4, which is to begin airing this summer. \"Angie Harmon plays tough-as-nails Boston police detective Jane Rizzoli, while Sasha Alexander is the smart, impeccably dressed medical examiner Maura Isles,\" a synopsis said. \"Despite being complete opposites, the two women share an offbeat chemistry and strong working relationship that lets them solve complex murder mysteries in the city of Boston.\"