Together at last: After four seasons of sparring and heated banter, TV's dynamic crime-solving team finds romance! Now that Castle and Beckett have finally given in to their true feelings for each other, how will it affect their work together? AS they try to keep their new relationship under wraps from their co-workers, the unlikely duo must track down the murderer of Beckett's mother, find the perpetrator of a major conspiracy and untangle a line of investigation that links Castle to a ritualistic killing.