During the investigation, they recall visiting the morgue to see Lanie, who found a . Castle notices a postal barcode on the back of the paper, which becomes the key piece of evidence used to track where the document was sent from and eventually lead them to the culprits. Key Highlights of Season 4
Season 4 is widely regarded by fans as a peak for the "Caskett" relationship, focusing on themes of healing and change. Castle - Season 4
: The season concludes with the long-awaited payoff in the finale, "Always," where Castle and Beckett finally share their first real kiss and become a couple. During the investigation, they recall visiting the morgue
Watch these deleted scenes from Season 4 for extra character moments and insights not seen in the original broadcast: 'Castle' Season 4 Deleted Scenes [1080p HD/CC] YouTube• Jul 21, 2023 : The season concludes with the long-awaited payoff
: The season features a notable appearance by Meghan Markle in the episode "Once Upon a Crime," where she plays a serial killer who dresses victims as fairy tale characters.