The Castle episode , which first aired on January 3, 2011, centers on actress Natalie Rhodes shadowing Detective Kate Beckett to prepare for her role as Nikki Heat in the film adaptation of Castle's novel, Heat Wave . Plot Summary
: Throughout the case, Natalie begins to mirror Beckett’s mannerisms, speech, and even her expensive fashion choices. This delights Castle but deeply unnerves Beckett, leading to an awkward confrontation where Natalie deconstructs Beckett and Castle's unresolved sexual tension. [S3E11] Nikki Heat
: The team investigates the death of Stacy Collins, a high-end matchmaker found impaled on a fence. They discover Stacy was secretly running "honey traps," using an escort to catch unfaithful husbands so their wives could secure better divorce settlements. The Castle episode , which first aired on