As season 10 of Criminal Minds returns after a hiatus, the upcoming episode, titled 'Lockdown,' has an exciting case for the BAU, where the suspects are already be in prison.

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According to the episode synopsis, two private guards in a prison are murdered and it is an inside job.

Here's the synopsis:

"When two guards at a privatized maximum security prison in Texas are murdered, the BAU suspects that more than one UnSub within the prison could be at work, on CRIMINAL MINDS, Wednesday, March 4 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Series star Thomas Gibson directed the episode. William Ragsdale ('Justified,' 'Herman's Head') guest stars as prison captain Dale Shavers."

Meanwhile, there has been a lot of buzz surrounding the Criminal Minds spin-off. A recent report revealed that actor Daniel Henney is the latest cast addition to the Criminal Minds spin-off, production for which is now underway. 

The production for the Criminal Minds spin-off has begun, as evidenced by an image posted on Twitter by actor Joe Mantegna, who plays David Rossi on the show.

Mantegna posted a behind-the-scenes picture featuring himself with Gary Sinise, who is playing the lead in the spin-off. Both actors are seen smiling for the camera with the Criminal Minds logo in the backdrop.

"Welcome my pal @GarySinise to the Criminal Minds family!" he tweeted. 

Breaking Bad's Anna Gunn has also recently been cast in the Criminal Minds spin-off.

The episode is going to air on March 4 on CBS.