CBC's "Murdoch Mysteries" will be back with yet another brand new episode on 12 October that will see Mark Twain seeking detective William Murdoch's help after he starts receiving death threats.

According to the synopsis of the episode "Marked Twain", the writer will make a controversial speech in this week's episode, stirring up trouble. The role of Mark Twain will be essayed by William Shatner.

Click here to watch a sneak peek of the episode online.

As for the relationships featured on the show, showrunner Peter Mitchell teased in last season that fans will get to see a lot more of William and Julia's sizzling chemistry.

"We did give the fans some of that last season, but they wanted more," actress Hélène Joy, who plays Julia, told TV, eh? "What they did get, they loved. We're allowed to play and flirt and be completely open and there is way more of that this year because we know how much the fans love it."

Now that the couple is married, the next logical step for them is to start a family. But Joy feels William and Julia would make terrible parents. "I think it would be hilarious because I think they'd be terrible parents. They're a couple of nerds who don't really have any idea what they're doing. Neither of them would stop working, so how would they balance that?"

"Murdoch Mysteries" airs Mondays on CBC. The official synopsis of season 9 episode 2 reads:

At a Toronto speaking engagement the celebrated author and humorist Mark Twain makes some controversial comments which lead to threats made against him. Murdoch and the Constabulary must protect the most famous American of the late 19th century.