Jonny Lee Miller, Rhys Ifans Jonny Lee Miller, Rhys Ifans

When Elementary heads to London this fall, Sherlock Holmes (Jonny Lee Miller) won't be able to keep his life a secret any longer.

In a new preview for the upcoming sophomore season, Joan Watson (Lucy Liu) is shocked to meet Sherlock's brother Mycroft (Rhys Ifans), to whom Sherlock hasn't spoken in years. Sherlock will be forced to confront his estranged brother when Mycroft allows him and Joan to stay in his new home at — wait for it, Holmesian fans — 221B Baker Street.

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Watch the preview below and stay tuned for more scoop on Mycroft in this week's Mega Buzz!

Elementary returns Thursday, Sept. 26 at 10/9c on CBS.

(Full disclosure: is owned by CBS.)