Why did Kitty Winter return to New York?
That was addressed on Elementary Season 5 Episode 16 when the protégé appeared after a three-year absence.
Links were found between a case Kitty and Sherlock worked together on during their time in London.
Meanwhile, Watson discovered Kitty had a life-changing secret, but which one of them revealed the secret to Sherlock?
Did they manage to find the killer?
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Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.