This series was a little hard for me to get into right at first because I had to get over the Mal thing. I also had some problems with the part of Kate. I took a great effort suspend my disbelief that a woman detective, working in an all male environment came to work every day in high heels, too tight pants, and shirts unbuttoned half way to her navel.
Also Castle always looks like he needs a shave. I understand that they (the shows producers or whoever it is that makes these decisions) are probably going for a rugged sexy look that they hope is a turn on for the young (and maybe not so young) ladies watching. I finally accepted that this series was being marketed too a much younger audience than me so got over it.
One of the best shows to emerge midway through the 2008-2009 TV season, Castle has a cast and a sense of humor that set it apart from the normal police procedural. Nathan Fillion plays Rick Castle, a bestselling author of pulpy crime novels who's called in to assist the New York police when a serial killer begins committing copycat murders based on situations in his books. Castle helps crack the case, then decides to kill off his longtime character and create a new one, named "Nikki Heat," and research her by shadowing Det. Kate Beckett (Stana Katic). Much to her irritation, he pulls strings with the mayor's office to embed himself in the department, and helps her solve a wide range of whodunits, including a woman drowned in a bath tub full of motor oil, another frozen and suspended at a construction site, and a corpse stuck in a clothes dryer. To alleviate the grim proceedings, Fillion is in his element as the wisecracking Castle, while adding another ray of sunshine is Castle's impossibly likeable teenage daughter, Alexis (Molly Quinn), who lives with Castle and his mom (Susan Sullivan), a former Broadway star. Castle's circle of poker buddies includes veteran TV writer-producer Stephen J. Cannell and author James Patterson playing themselves. Like many (or most) he-and-she cop shows, there's an element of "Will they or won't they…?", but the beautiful Katic keeps Castle at bay by radiating cool. Clearly she's a woman who wants to separate herself from her emotionally draining and predominantly male job, so it makes it all the more enjoyable when she momentarily steps out of that mode, such as an impromptu appearance at his book signing. Much to the relief of Fillion fans who feared their man was a show killer after the aborted runs of such shows as Firefly and Drive, Castle was renewed for a second, full season.