Castle Spoilers: Season Premiere Sets Up Mystery, Why Did Rick Vanish?

After an interesting Castle season premiere, it appears there is still a puzzle to be solved.

TVLine reports that that only a couple of elements are solved by the time the hour ends and as a result, Beckett is left feeling unsatisfied. Apparently discovering the ‘who, why, and how’ of Rick’s disappearing act will be one of the core focuses of the season.