Complete story — includes the ending
An elderly couple dies in bed. They are inadvertent casualties of another crime committed elsewhere in the building. Someone burned rubber in the basement, which emitted a toxic gas. Sherlock finds a burned body with a tire around his neck. Clay Dubrovensky was the second floor tenant who worked for the criminal SDS Cartel, growing marijuana for them. A valuable orchid, the last of its kind, grows in the greenhouse. Barbara Conway, from AgriNext, bought an orchid from Clay. Sherlock examines both plants and realizes that Clay cloned the orchid twice. Two AgriNext executives are murdered by the same burning tire necklace method, and their bodies dumped in front of the AgriNext building. However, the rope is different from that used in Clay's murder. Conway admits that AgriNext offered Clay a job and was trying to buy out his relationship with the SDS. The police arrest the SDS member guilty of the AgriNext murders. He denies killing Clay. Conway turns out to have killed Clay because he was seeing his ex-girlfriend again.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, List of Elementary episodes. HTML formatting and reference markers removed. · Content license