On its first broadcast on BBC One , the episode received 11.37 million viewers , a 32.1 % audience share . Although this was a drop from " The Sign of Three " and " The Empty Hearse " , it became the most tweeted-about single episode of a drama series in the UK . The episode received critical acclaim , and Mikkelsen 's performance as Magnussen , in particular , was praised . For their performances in the episode , Cumberbatch and Freeman both won the Emmy Awards for Outstanding Lead Actor in a Miniseries or a Movie and Outstanding Supporting Actor in a Miniseries or a Movie , respectively . Moffat also won the Primetime Emmy Award for Outstanding Writing for a Miniseries , Movie or a Dramatic Special for his work on the episode
Emmy Awards
66th Primetime Emmy Awards
His Last Vow