Ep 19. One Watson, One Holmes

In Elementary season 3 episode 19, "One Watson, One Holmes," Sherlock and Joan investigate the murder of a man who was drowned in a bathtub filled with motor oil. As they dig deeper into the case, they discover that the victim was a programmer who was working on a project for a high-tech company that specializes in artificial intelligence.

As they look into the company, they meet a young woman named Fiona, who claims to be the project's lead developer. She initially seems helpful, but as they continue to question her, they begin to suspect that she might be involved in the murder. Meanwhile, Sherlock and Joan also begin to suspect that the project the victim was working on could potentially have dangerous implications for society.

As the investigation progresses, Sherlock and Joan must navigate their complicated relationship. They each have their own ideas about how to proceed with the case, and tensions between them begin to mount. Despite their disagreements, they continue to work together, pushing each other to uncover the truth about the murder and the AI project.

Along the way, the episode also delves into the personal lives of both Sherlock and Joan. Sherlock struggles with the aftermath of his recent breakup with Fiona, while Joan begins to realize that she may have feelings for her boyfriend, Andrew.

Overall, "One Watson, One Holmes" is a tense and complex episode that explores not only the challenges of solving a difficult case, but also the intricacies of the relationship between Sherlock and Joan. With plenty of twists and turns along the way, it's sure to keep viewers on the edge of their seats.