Who killed an ex-Yakuza gang member?
That was revealed on Elementary Season 6 Episode 6 when the investigated the world of nuclear security.
However, the pair realized they had bitten off more than they could chew when they were put in danger.
Also, Captain Gregson was blindsided by a stunning personal confession from his daughter.
What was it all about, and did he manage to move on from it in a swift manner?
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Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.