Well...I did post the article regarding the plummeting ratings this season (the winter hiatus episode being the lowest rated episode ever) . I haven't checked the ratings for Monday's episode yet. I have a suspicion that "Castle" could end either this season, or perhaps be granted one last season next year. So far though I've not really had a problem with this season. Monday's episode was clearly a filler episode. I'm still convinced that the second half of the season will refocus on the JB murder case, we will be revisiting the Senator as well, and possibly be introduced to Rick's dad finally.