Martha gets a visit from an old friend who also ends up at the 12th precinct with Castle. While back at home, Rick gets an unexpected visitor at this door. Perhaps he needs to get a camera at his door...or a peephole.

Check out these photos from Castle Season 8 Episode 4, "The Nose" scheduled to air Monday, October 19, 2015 on ABC.

1. Who's At the Door? - Castle Season 8 Episode 5

Always check who's on the other side of that door before opening it. Didn't Castle always tout how he lived in a secure building? Security seems to be lacking.

2. Things Get Dangerous - Castle Season 8 Episode 5

Is Castle now bringing cases home with him? Maybe he should consider giving up the P.I. business.

3. Martha Looks Happy - Castle Season 8 Episode 5

Martha looks as though she's happy to see an old friend. She's also wearing gorgeous blue earrings that are so very Martha.

4. Stephnie Weir Guest Stars - Castle Season 8 Episode 5

Stephanie Weir guest stars as someone who appears to be an old friend on Castle Season 8 Episode 4, "The Nose"

5. Martha Shares Stories - Castle Season 8 Episode 5

What kind of stories is Martha sharing about Rick and her family? We'll have to watch Castle Season 8 Episode 4 to find out.

6. At the Precinct - Castle Season 8 Episode 5

And why is Martha's friend at the 12th precinct with Rick? How is she wrapped up in the case?

7. Brown Paper Bags - Castle Season 8 Episode 5

We're hoping everything turns out okay but brown paper bags don't really seem Castle's style. Maybe he'll break out the good stuff when Kate finally comes home.