The Season 6 of "Castle" began with Kate Beckett accepting Rick Castle's marriage proposal. The M of marriage has not been discussed in detail in the ten episodes aired till now, as the engaged couple has been busy solving the M of Murder Cases. The new preview of episode 11 suggests that Beckett doubts Castle's commitment to their engagement.

The teaser preview of episode 11 revolves around Castle's engagement commitment. In the preview clip of Episode 11, one can hear Beckett saying to Castle: "I'm worried about your commitment to our engagement." The clip also shows a reporter asking Castle if he get back together with his ex-wife. We wonder what has happened that has put Castle in the dock and what is making Beckett apprehensive. The episode might address the question of marriage properly, putting a murder case in the background.

 [Youtube/1televisionpromos]

In addition to marriage mystery, there is also the suspense surrounding Jenny Tyson aka 3XK (The Triple Killer). In episode 9 of "Castle" Season 6, "Disciple," all the files related to 3XK disappeared and also all the evidence from the lab. A cosmetic surgeon was also a prime suspect in "Disciple." She too disappeared before the NYPD team could arrest her.

If Tyson is alive and appears in front of Castle and Beckett, there is a possibility that he might have a new face. In an interview with TV Line, Andrew W. Marlowe, series creator of "Castle" agrees that "it is certainly possible that Tyson, if alive, may have altered his appearance.

However, he added "Castle shot Tyson multiple times in the chest. He fell 100 feet into the water. How could he have possibly survived that."

When asked if Tyson's mystery will surface again in the upcoming episodes of "Castle" Season 6, Marlowe said: "I think Vera Lynn said it best when she sang, 'We'll meet again. Don't know where... Don't know when...."

"Castle" Season 6 is scheduled to return with a new episode on Jan. 06, 2014.