Nikki Heat
Castle's novel "Heat Wave" is being turned into a movie, and the Hollywood hottie cast as the movie's lead, Natalie Rhodes, shows up at Beckett's invitation to better understand the character she's going to play. As our threesome investigates the murder of a high-class matchmaker, Natalie goes to extremes in the name of "character research," transforming herself into the spitting image of Beckett -- much to Castle's delight and Beckett's dismay.
