Complete story — includes the ending
Everyone member "Species", real name Errol White, is killed by a now-missing samurai sword. It is later revealed that Species was secretly two people, an arrangement that allowed Species to always be online. The other half of Species is someone named Bradley Dietz. Dietz killed White when he rejected Dietz's idea of hacking think tank the Atherton Foundation, feeling that it was too dangerous. Dietz is capitalising on Everyone's sympathy for Species's death to gain power, and the hack is imminent. When confronted, Dietz is rescued by FBI Agent Branch, who provides an alibi. Branch wants Everyone to hack Atherton, which coordinates FBI and Homeland Security investigations with the internal security departments of major corporations. If Everyone hacks Atherton, the group would be arrested for treason and Branch would gain rapid promotion. Sherlock knows Branch's secret (knowingly exploiting an illegal immigrant) and will report her unless she gives the police an anonymous tip on where to find the sword. Everyone is warned about Atherton, so Dietz becomes useless to her. Branch caves in. Dietz is arrested.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, List of Elementary episodes. HTML formatting and reference markers removed. · Content license