WHAT IT'S ABOUT Xavier Collins (Sterling K. Brown) is a Secret Service agent tasked with protecting President Cal Bradford (James Marsden) while he's in office, and afterward — while Bradford's living in bucolic retirement in a sprawling McMansion where during his off-hours he slings back whiskeys and entertains another member of his security detail (Krys Marshall,

The political sci-fi thriller is a great sign for TV this year, though it routinely reveals itself to be better on paper than in practice.