Well, kudos to Castle for his dogged loyalty. However misplaced it turned out to be.
It was unusual to see Kate and Castle at such odds over whoodunit, but an interesting exercise in the wise gently leading the blind. I mean, I was assuming Castle must have had it right, because ultimately he always has it right. But this time, the usual back and forth over each of the possible suspects hit Castle right where he lives. Directly in the non-Hollywood ending. Smack-dab in the middle of his writer's fantasy, ideal world.
Thankfully for Castle and despite the painful introspection, with Kate there, the landing was a soft one for our Peter Pan.
Now, about that Valentine's Day rat-framed photo? Didn't the vermin go missing? Like permanently? On Alexa's watch too? Was this an In Memorium Valentine's, and how weird is that?