In the Castle episode 'Disciple' (S06E09):

Castle and Beckett eventually come to the conclusion that Kelly Nieman played a part in the murders, and go on to discuss about it at the loft while Castle is playing with a pen found at her abandoned office. This pen, he finds, holds a flash drive. When he plugs it in, he finds an audio file. It's a song, one that scares the shit out of Beckett. She is visibly shaken.

The song is called "We'll Meet Again" by Vera Lynn. Do we know the significance of this? It cannot simply be Dr. Neiman taunting Beckett. She would not have been so shocked and acted so broken. And since 3XK always troubled Castle more than Beckett, I have a hunch that song is somehow related to her mother.


As of this writing (11.21.2013, or 21.11.2013 for our European visitors), there isn't a definable meaning available. Most blog posts and references that I can find speculate in one of two directions:

  1. Mother - It's related to her mother, and that is why she looks so shaken.
  2. Recurrence - It's a thinly veiled allusion that a serial killer has returned, and may possibly be stalking her personally.

In either case, there is nothing proven yet, only speculation.

  • The 3XK story arc is over and I'm still not sure of it's significance. I probably missed something, as I haven't been completely faithful to the show. I would appreciate it if you updated your answer.
    – Siddhartha
    Feb 28 '15 at 6:47

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