Complete story — includes the ending
Software developer Edwin Borstein has created an artificial intelligence (AI) program called Bella, and he hires Sherlock because someone has broken into his company and stolen a copy of the program. Sherlock takes the case, not because he finds it interesting, but because he does not believe AI is achievable. He solves the theft case, but then Borstein dies from a fatal epileptic seizure, seemingly caused by Bella through rapidly cycling images displayed on Borstein's monitor. Sherlock finds a program hidden on a music CD death metal fan Borstein was given. Eventually he traces the criminal to a think tank that believes that AI is the greatest threat to human existence. He is confident that its leading light, computer science professor Isaac Pike, is responsible, but a devotee confesses, despite having no programming skills. Meanwhile, Joan's boyfriend Andrew receives a job offer that would take him to Copenhagen, and Joan wonders if Sherlock is responsible for it.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, List of Elementary episodes. HTML formatting and reference markers removed. · Content license