The banter between them for four years was fantastic as they would do anything and risk anything for each other. Luckily they finally became a couple because Beckett knows Castle will be there for her. Always.
Blame it on love. After some exquisitely protracted flirtation, roguish mystery writer Richard Castle (Nathan Fillion) and keen NYPD homicide detective Kate Beckett (Stana Katic) are finally exchanging pillow banter in the fifth season of Castle.