When you watch Elementary Season 4 Episode 3, a masked man bursts into an apartment and holds a man at gunpoint before shooting him, only to have a second, identical man walk in the front door a moment later. The masked man shoots him, too, before fleeing. Sherlock and Joan, freshly reappointed as consultants to the NYPD, dive right into the investigation, which leads them to a facial recognition development company and a lookalike-finding software that exploited the company's code. Throw into this mess an eleven-year-old cold case murder, and you have a recipe for a confusing mess of who did what to whom and when. Meanwhile, Sherlock is distracted by his father's continued presence in New York City. He agrees to help Morland complete his current job in order to speed Morland's departure from the city. Together, they match wits with a brilliant hotelier who is standing in the way of a development by one of Morland's clients. Will Sherlock be able to put aside his dislike of his father long enough to complete the job, so his father will finally leave? Will Sherlock and Watson be able to solve the case of the doppelgangers? Find out when you watch Elementary Season 4 Episode 3 online!