SPOILER ALERT: This story discusses major plot points, including the ending for “Saltburn.” In the final moments of Emerald Fennell’s “Saltburn,” Sophie Ellis-Bextor’s 2001 song, “Murder on the Dancefloor” pumps out over the speakers, while Barry Keoghan’s Oliver dances stark naked through a grand estate house in the British countryside. “Everything is diabolical, but it’s exhilarating,” […]