CASTLE — SEASON 9 (2026)

Nathan Fillion | Stana Katic

What if your novels weren’t fiction anymore… but evidence?

In Season 9, the boundaries between Richard Castle’s fictional world and reality begin to blur. A serial killer emerges, recreating murders from Castle’s books with terrifying precision. As the bodies pile up, Castle, once a celebrated crime novelist, is thrust into the very world he’s spent his life writing about—but this time, the stakes are real.

Forced to confront the chilling fact that someone is using his words as a blueprint for terror, Castle partners once again with the brilliant but skeptical Detective Kate Beckett. Their bond, forged through years of solving cases, is tested as they navigate the increasingly personal nature of the crimes. The smart cases are now darker, the deadly twists more unpredictable, and the signature banter between them—still there, but laced with more urgency.

As Castle’s past comes to haunt him, it becomes clear that the killer isn’t just after victims. They’re after him.

The most dangerous story… is the one that knows you.

This season brings fans everything they love: smart cases, witty dialogue, and deeper emotional stakes. But this time, Castle and Beckett must face a killer who knows their every move—and knows their darkest secrets.