The Empty Hearse Two years after his reported Reichenbach Fall demise, Sherlock, who has been cleared of all fraud charges against him, returns with Mycroft's help to a London under threat of terrorist attack.
The Sign Of Three It is John and Mary's wedding day and Sherlock is daunted by the task of delivering a Best Man's speech. Before his speech ends, he realises that a murderer is present among the guests intent on killing a fellow guest. Sherlock informs John and Mary of the meaning of the sign of three.
His Last Vow Stolen letters lead Sherlock into conflict with Charles Augustus Magnussen, "the Napoleon of blackmail" who knows the personal weakness of every person of importance in the Western world. During the investigation Sherlock is shot and nearly killed by someone who is being blackmailed by Magnussen.
The Abominable Bride Rejoin Benedict Cumberbatch and Martin Freeman in another case for Holmes and Watson - in the 1890s.