It is often said that the extended Kennedy family is the closest thing America has to royalty, and they certainly rival royals in assassinations, plane and car crashes, charismatic derring do, and unhealthy entitlement. Then there’s the love story cut short. John F. Kennedy Jr. and Carolyn Bessette, a couple as beautiful as they were elusive, are the subjects of a new Ryan Murphy series that attempts to capture their essence. —Carolina de Armas