'Possibility Two'-- Sherlock (Jonny Lee Miller, right) and Gregson (Aidan Quinn, left) investigate a case involving a wealthy philanthropist who believes his incurable illness was given to him on purpose, on ELEMENTARY, on a Thursday, Feb. 21 on the CBS T Photo

From: Photo Flash: ELEMENTARY's 'Possibility Two,' Airing 2/21

On ELEMENTARY's upcoming episode, titled 'Possibility Two,' Sherlock (Jonny Lee Miller) and Gregson (Aidan Quinn) investigate a case involving a wealthy philanthropist who believes his incurable illness was given to him on purpose on Thursday, Feb. 21 on CBS.