[s2e21] Den - Of Thieves

This episode is often cited by fans as one of the best for the dynamic, giving Jon Huertas a chance to showcase a more vulnerable side of his character.

While the case provides the grit, the B-plot introduces significant friction to the Castle-Beckett dynamic. [S2E21] Den of Thieves

: Detective Demming continues his pursuit of Kate Beckett, much to Rick Castle's annoyance. This episode is often cited by fans as

: Esposito is forced to confront the possibility that his old mentor may have "gone bad" and joined the crew of Victor Racine , a ruthless crime lord who has eluded the police for decades. : Esposito is forced to confront the possibility

: The episode title refers not just to the criminals, but to the feeling that Demming is "stealing" Beckett away from Castle, and Racine’s ability to "steal" the lives of cops who get too close.