A familiar face returns to Murdoch Mysteries this week. Yes, the former Chief Constable Giles, played by the always-great Nigel Bennett—his back and forth with William in “What Lies Buried” is amazing to watch—figures in Monday’s episode.

Here’s what the CBC has revealed about the main storyline, written by Murdoch author Maureen Jennings and directed by Shamim Serif.

When Murdoch and Ogden investigate a prison inmate’s suspicious suicide, they discover rival gangs in the jail.  

And here are more notes from me after watching the episode in advance.

Filming on location
Murdoch Mysteries filmed the prison scenes at the now-closed Kingston Penitentiary. Kudos to director Shamim Serif for capturing the feel of the old building and its wonderful architecture. That’s not the only area of Kingston, Ont., to be co-star. The market square area behind the city hall is prominently featured too. I laughed out loud at that what I think is a reference to the venerable Chez Piggy.

Margaret is back!
Also, keep an eye out for Shailene Garnett as Nomi Johnston, Adam Kenneth Wilson (formerly Jagger Brown) as Deputy Warden Brian Kelleher and Liisa Repo-Martell (who played Lydia Howland in a past instalment) as Bridget Mulcahy.

Meanwhile, in Toronto
Inspector Brackenreid has got his hands full with striking Bell Telephone Systems operators, and the cells are filling up. Not only that, but Nomi appears and shakes up his world.

Murdoch Mysteries airs Mondays at 8 p.m. on CBC.

Images courtesy of CBC.