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John asks if he has heard from her at all, leaving Sherlock to admit that he had received one text, reading "Goodbye Mr Holmes". Irene slid her hand up to Sherlock's and he reacted by holding his hand back to hers. Musician Eos Chater worked as Benedict Cumberbatch's violin coach for this episode. Sherlock spends much of the episode keeping the device out of enemy hands while trying to deduce its password. Sherlock, having followed John, learns of Adler's survival. Mycroft Holmes is an adversary of Irene's, whom she blackmails several times within " A Scandal in Belgravia ".