Just before the credits at the end of Castle S06E09 there is this scene:

The look on Becketts face made me think it could have an underlying meaning other than 3XKs return anyway.

  • All I can think of is that it's called "We'll Meet Again," implying that he's still around.
    – Tom
    Apr 23 '16 at 19:23
  • @Tom seems like the answer is probably just 'no' then :) Apr 23 '16 at 19:32
  • Maybe he also planned to nuke the planet? ;)
    – Walt
    Oct 28 '16 at 21:31

As Tom has said, it meant that either:

  1. 3XK is around.
  2. It was speculated that the song had a profound meaning to Beckett (related to her marriage / mother) that 3XK knew about.

Unfortunately we never got around to explore these two cases.

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