Complete story — includes the ending
Sherlock is furious with Joan because she did not inform him about her recruitment/blackmailing of a person in Morland's organization. The two of them suspect Morland of ordering the assassination in the diner, but the evidence points elsewhere after the suspect confesses to both it and another murder for hire by the same person two weeks earlier. The first victim, Patricia Naylor, was a psychiatrist who had devised an online survey called the Depravity and Atrocity Numeration Test (DANTE), which asked takers to choose the least terrible of sets of disgusting options to help set sentencing guidelines for heinous crimes. However, Sherlock suspects the survey has been used to instead identify psychopaths who can be recruited. He discovers that Naylor's lab assistant was selling test results to a person she initially thought was with the CIA. The names used by the contact, two holders of the chair of mathematics at Cambridge, alert Sherlock of the involvement of his longtime adversary, Moriarty.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, List of Elementary episodes. HTML formatting and reference markers removed. · Content license