VIDEO: Sneak Peek - Tonight's Season Premiere of CBS's ELEMENTARY

On tonight's second season premiere of CBS's ELEMENTARY titled 'Step Nine,' Holmes and Watson travel to London to help track down an old mentor and investigate an unsolved mystery. 

Meanwhile, Mycroft Holmes (Rhys Ifans), Sherlock's estranged brother, reunites with Sherlock and reveals some secrets of his own.

The episode airs tonight, Thursday, Sept. 26 (10:01 – 11:00 PM, ET/PT) on the CBS Television Network. Filmed on location in London, England. Get a sneak peek below!