In the fourth season, which aired on NBC, the writers retained Los Angeles as the setting, but the Hefner-esque fantasy elements were considerably toned down. Now Diamond again operated from an office reminiscent of what he had known in New York, and his beautiful ranch house was replaced by an attractive—though more conventional—apartment. His car phone still connected him to Sam, but he now drove a 1959 Ford Galaxie convertible—absent the impressive tail fins of his DeSoto. Though the opening titles remained, Rugolo's score was replaced by a more sedate theme, "Nervous" by Richard Shores, later to be used during the highlight sequence that began every episode of "The Dick Powell Show". The CBS Season 3 re-boot had aired on Sunday nights at 10 pm, but NBC moved the time slot to 7:30 pm Monday, and Season 4 began airing on October 5, 1959, with a 17-episode run that concluded late in January. Because its numbers were no longer strong, the season's nine additional episodes were delayed, resuming only as a summer replacement on Tuesday, July 5, 1960, and concluding in early September. Though the old "noirish" elements were more prominent, the look of the final season seems inspired more by cost-cutting than aesthetics, and the production values appear far less glamorous than Season 3.