Now that Richard Castle's first Nikki Heat novel is getting the movie treatment within the ABC series Castle, TVGuide.com hit the set to find out who Nathan Fillion and Stana Katic think should play castelo and Beckett in the film.
A murder-mystery writer and a detective team up to catch a serial killer who is reenacting murders from his books. Once the case is solved, the unlikely pair continue to work together to probe New York City's most unusual homicides.