The premiere finds the lead characters, Richard Castle and Kate Beckett, adjusting to major professional shifts.
: Unlike many procedural episodes, "XY" adopts a more cinematic, high-stakes tone as it sets up a seasonal conspiracy. Production and Critical Reception Air Date : September 21, 2015.
: After receiving a mysterious phone call, Beckett disappears. Castle finds a bracelet he gave her earlier that day at a triple murder scene, sparking a frantic search that involves new characters like Hayley Shipton , an independent security specialist. Key Themes and Character Developments