Complete story — includes the ending
Oscar Rankin kidnaps Alfredo to leverage Sherlock into finding Oscar's missing sister Olivia, a fellow drug addict. Sherlock searches for Olivia with Oscar, visiting his former rehabilitation center and an active heroin den. At the den, the discarded contents of a stolen wallet contain the driving licence of Jonathan Bloom, a sexual predator who lures with heroin and is believed to have killed two women. Sherlock tortures Bloom into admitting that he took Olivia but she fought him, stole his money and heroin and escaped in a taxi. Olivia then went to an abandoned railway tunnel. There, Sherlock finds her dead of a heroin overdose. She has been dead for two days. All along Oscar knew of this. Oscar led Sherlock through the places Olivia had been to make him realize that Sherlock is as bad as he is and that it is inevitable that Sherlock will use again. Oscar then reveals a box with heroin, saying that he needs one more push. Joan texts Sherlock that they have found Alfredo alive. Sherlock beats Oscar, and picks up the box. Days later, Joan, unable to get Sherlock to talk about his relapse, reports that Morland will soon arrive.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, List of Elementary episodes. HTML formatting and reference markers removed. · Content license