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A surprise visit from Sherlock's brother Mycroft leads to discord between Holmes and Watson. Meanwhile, Sherlock and Joan investigate a missing person's case that takes them into the world of unmanned aeronautics.
Holmes and Watson investigate what appears to be a routine murder but soon discover that it has international and political implications, which then brings them into contact with MI-6. Meanwhile, in the wake of a crisis, Joan re-evaluates her relationships (more…)