Elementary 2x6 An Unnatural Arrangement Season 2 Season 1 24 EpisodesSeason 2 24 EpisodesSeason 3 24 EpisodesSeason 4 24 EpisodesSeason 5 24 EpisodesSeason 6 21 EpisodesSeason 7 13 Episodes 2x1 - Step Nine 2x2 - Solve for X 2x3 - We Are Everyone 2x4 - Poison Pen 2x5 - Ancient History 2x6 - An Unnatural Arrangement 2x7 - The Marchioness 2x8 - Blood Is Thicker 2x9 - On The Line 2x10 - Tremors 2x11 - Internal Audit 2x12 - The Diabolical Kind 2x13 - All in the Family 2x14 - Dead Clade Walking 2x15 - Corpse de Ballet 2x16 - The One Percent Solution 2x17 - Ears to You 2x18 - The Hound of the Cancer Cells 2x19 - The Many Mouths of Aaron Colville 2x20 - No Lack of Void 2x21 - The Man With the Twisted Lip 2x22 - Paint It Black 2x23 - Art in the Blood 2x24 - The Grand Experiment When Captain Gregson’s home is invaded, Holmes and Watson work to find the masked gunman before he strikes again. Meanwhile, Gregson gives his team some insight into his private life.