By Nicole Rojas (staff@latinospost.com) | First Posted: Sep 21, 2013 01:55 PM EDT

CBS’ hit Sherlock Holmes drama “Elementary” returns for its second season in just a few days with a special London-based premiere. Sherlock (Jonny Lee Miller) and Joan Watson (Lucy Liu) will kick off the new season by leaving New York City behind and heading back to Sherlock’s childhood home.

According to CBS, “Holmes and Watson travel to London to help track down an old mentor and investigate an unsolved mystery.” The two detectives won’t just be solving crimes, they’ll also be delving deeper into Sherlock’s past. CBS teases, “Meanwhile, Mycroft Holmes (Rhys Ifans), Sherlock’s estranged brother, reunites with Sherlock and reveals some secrets of his own.”

The reunion of the two brothers, who don’t appear to get along very well, will allow Joan to find out more about Sherlock’s life before he moved to New York City. But that’s not all. According to TVGuide, Sherlock and Joan make a bet about Mycroft: whether he wants to sleep with her or not.

TV Guide adds, “It’s not as implausible as it seems, since it would technically make things even. Let’s just say that the brothers will get even one way or another.” Did Sherlock sleep with someone his brother was romantically involved with? And what does Joan have to say about the brothers using her to even the score?

Mycroft won’t be the only one on Joan’s romance radar. As previously reported, “Once” actor Steve Kazee has been cast as a possible love interest for Joan much to Sherlock’s frustration. Fans will have to tune in to the second season to find out how Sherlock and Joan’s relationship develops.

“Elementary” Season 2 premieres on Thursday, September 26 at 10 p.m. on CBS.