Succession usually thrives on profane wit and eat-the-rich schadenfreude, but Sunday’s season 4 premiere offered a more melancholy form of darkness. While Jeremy Strong’s fragile Kendall Roy tends to be the focus of the show’s saddest moments, this time the characters under the microscope were his younger sister Shiv Roy (Sarah Snook) and her semi-estranged husband Tom Wambsgans (Matthew Macfadyen).