To begin with, Samantha Wabash commits suicide as a way to frame Lucas Bundsch, who she believes killed her sister Allie. Holmes sees through the fake suicide immediately, but the police still want to give Lucas Bundsch a polygraph test. And while that's happening, Holmes decides that not only did Bundsch kill Allie, he's probably a serial killer.
Gregson brings in Detective Coventry, the guy who worked the case. He looks suspiciously like Frank Sobotka. And also the sheriff on True Blood, although I officially deny watching that show. My point is that it's Chris Bauer, who's a pretty famous guest star. But he's not the murderer! In fact, the murderer is Lucas Bundsch the whole time, so it's not much of a mystery. Holmes and Watson find a couple of people they think Bundsch probably killed, so they talk to their next of kin, and nothing comes of that. But one of them says that someone from their online mourner group knows Bundsch, and that leads to a big wild goose chase where Holmes and Watson think they're trying to save a woman from Bundsch, but really it's Bundsch pretending to be this woman and nothing comes of it.
The underlying plot of the episode is that Holmes's brusque ways are annoying people to the point where it's impeding his investigations. Coventry refuses to work with him and even threatens to file a union grievance against Captain Gregson. And when Holmes confronts Bundsch, he allows himself to be baited into punching Bundsch in the face. So now there's a restraining order against him, which means he can't even investigate the guy he's convinced is a serial killer. When Bundsch strikes again, Holmes wants to plant some DNA in his car and thus frame him for a kidnapping Holmes is pretty sure he committed anyway. But at the last second, he realizes that he's keeping women in a closet in his recording studio so Bundsch is arrested after all. And Gregson tells the police force to quit complaining about Holmes being a jerk.
But why must Holmes be a jerk all the time? Watson calls him out on it, because obviously he's capable of being polite to her most of the time. At the end of the episode, Holmes gives a reasonably passionate defense of his right to basically be a jerk. Watson isn't entirely convinced, but I think he's got a point.
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A woman stands on a bridge at night. She looks like she's going to be jumping over the edge, but she takes a gun out of a bag and then throws the bag over the edge. She then lowers a dumbbell down toward the water. The dumbbell is attached to a wire, which is connected to the trigger of a pistol. She holds the pistol in front of her face, and the weight of the dumbbell pulls the trigger so she gets shot in the forehead and the pistol is pulled into the water below. She has the complicated-murder instincts of someone who's found dead in a locked room in a mystery novel from the 1930s.
Once it's daytime, Holmes and Watson get there and Holmes shouts at the police for moving the traffic cones. Gregson says the dead girl is Samantha Wabash. Before she died, she called 911 and said she was being followed by Lucas Bundsch, who owns a recording studio (irrelevant) and a .38 caliber revolver (more relevant). So they're pretty sure Bundsch is the killer. Samantha believed that Bundsch killed her sister, but he was never convicted. Holmes and Watson investigate Samantha's corpse, and Holmes stands where she was up against the railing. Gregson describes how much she'd been harassing Lucas, and Holmes announces that it's a suicide. His proof is that from the way she fell, she'd been standing two feet from the railing, which would mean the murderer would have to be basically nose-to-nose with her. Holmes also spots the scratches made by the wire, so he declares, "Drag the river beneath this spot, you'll find the weapon." Gregson is skeptical. Then he gets a call and says he's bringing Holmes and Watson to Bundsch's polygraph test.
Lucas Bundsch is hooked up to the polygraph in the interrogation chamber. Holmes and Watson are watching through the one-way mirror, although Holmes says this will be as boring as an evening of Trivial Pursuit. That surprises me, because I would have thought Holmes would enjoy a good game of Trivial Pursuit. It combines two things he likes very much: showing off how much he knows and beating people. Bundsch answers some standard questions, including "Did you murder Samantha Wabash?" and says his place was burglarized recently so his gun was stolen. Holmes seems very interested in his claim to have been mixing a record until 4 am. Someone comes in to say Bundsch is free to go because the gun was found, validating Holmes's suicide theory. Holmes rushes in to ask Bundsch if he killed Allie Wabash. The answer is no. Holmes shakes Lucas's hand.