Elementary 4x24 A Difference in Kind Season 4 Season 1 24 EpisodesSeason 2 24 EpisodesSeason 3 24 EpisodesSeason 4 24 EpisodesSeason 5 24 EpisodesSeason 6 21 EpisodesSeason 7 13 Episodes 4x1 - The Past Is Parent 4x2 - Evidence of Things Not Seen 4x3 - Tag, You're Me 4x4 - All My Exes Live in Essex 4x5 - The Games Underfoot 4x6 - The Cost of Doing Business 4x7 - Miss Taken 4x8 - A Burden of Blood 4x9 - Murder Ex Machina 4x10 - Alma Matters 4x11 - Down Where the Dead Delight 4x12 - A View With a Room 4x13 - A Study in Charlotte 4x14 - Who Is That Masked Man? 4x15 - Up to Heaven and Down to Hell 4x16 - Hounded 4x17 - You've Got Me, Who's Got You? 4x18 - Ready or Not 4x19 - All In 4x20 - Art Imitates Art 4x21 - Ain't Nothing Like the Real Thing 4x22 - Turn It Upside Down 4x23 - The Invisible Hand 4x24 - A Difference in Kind Holmes and Watson’s lives are threatened by an influential, worldwide criminal network connected to the murder attempt on Morland Holmes. Also, Sherlock’s grievances with his father threaten their alliance to bring their mutual adversary to justice.