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Mycroft does his secret government thing and gets Sherlock off for murder so that he can go home and solve cases and have tantrums and such. John and Mary welcome baby Rosie into the Baker Street posse and she goes on her first case, proving to be extremely... unhelpful. Sherlock learns who Margaret Thatcher was despite already knowing in The Hound of Baskerville, and comes across another flash drive because assassins don't use the cloud... Mary goes AWOL, then comes home because the sharks are circling... ok, maybe one shark, one old lady shark who tries to kill Sherlock, but Mary defies the laws of physics in order to save him...

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4x01 The Six Thatchers