Tags: Elementary Season 4 Spoilers

‘Elementary’ Season 4 Episode 17 will air on March 20 after CBS moved the schedule. Sherlock and Joan investigate the death of a vigilante.

‘Elementary’ season 4 episode 15 will see Holmes and Watson investigate a socialite killer. Joan accidentally intrudes some private life.

‘Elementary’ Season 4 Episode 14 will feature Sherlock Holmes' mother. “Who is That Masked Man” reveals tragic story.