"Must-See TV: 'Only Murders' Season 3 and 'Red, White & Royal Blue' Take Center Stage"

This week's must-watch picks include the season premiere of "Only Murders in the Building," a secret affair in "Red, White & Royal Blue," the final seasons of "Billions" and "High School Musical: The Musical: The Series," and Gal Gadot starring in the action-thriller "Heart of Stone." Other highlights include the premiere of "Painkiller," a series about Purdue Pharma's alleged role in the opioid epidemic, and new episodes of popular shows like "The Bachelorette," "Love Island USA," and "MasterChef."