'Castle' Season 7: Premiere spoilers and production begins

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"Castle" Season 7 is on its way, with production on the premiere episode beginning. What's coming in that episode? Keep reading for a few spoilers.

Messages from stars Stana Katic and Jon Huertas made it clear on Thursday (July 17) that they were back at work by messages posted on social media. Katic tweeted a photo of herself on the set:



She also posted a link to Huertas in a photo that indicated the Esposito actor is not happy with his trailer this season:



What are they working on? According to TVLine, the Season 7 premiere will be a two-part episode that resolves the seemingly deadly car crash that postponed the Castle-Beckett wedding in the Season 6 finale. Guest characters in the premiere include "Henry" -- an intelligent man who can blend into a crowd -- a police sergeant in the Hamptons, a doctor, a psychiatrist and a Coast Guard captain.

"Castle" Season 7 premieres Monday, Sept. 29 at 10 p.m. ET/PT on ABC.

Photo/Video credit: ABC, Twitter, WhoSay