Watson gets offered a case of her own where she has to look through files to discover who's been robbing falafel carts. Now forget about the case, because Watson doesn't have time to work on it and Holmes solves it offscreen.
In the actual case, someone breaks into Captain Gregson's house with a gun! But his wife not only gets the intruder to leave, she also manages to shoot him in the shoulder. The ensuing investigation quickly establishes that Gregson and his wife are separated, which is a shame for them, but not actually that useful in terms of getting the case solved. Holmes goes through Gregson's spam folder and finds a lot of emails from a weirdo who's obsessed with him. He and Watson look the guy up, and he does indeed have a bullet wound in his shoulder. But he gave it to himself because he was going to pretend to be the intruder. So that was a dead end.
Luckily, someone named Sam Clennon gets shot by someone who seems to be the same intruder! Well, I guess it wasn't that lucky for the guy who got shot. He just got back from Afghanistan and now he got shot in his own home. Holmes sees that he'd been stabbed at some point, and the guy who did it is in town. He seems a little unstable, and explains that he stabbed Clennon because they had a fight about Clennon having an affair with a married woman. But he has no bullet wound, so he's off the hook. The married woman in question is Beth Loney, an archaeologist played by Sarah Wynter. She suggests they talk to James Monroe, Clennon's commanding officer, who turns out to be Gregson's neighbor.
The neighbor is James Monroe and he's also been shot. This returns everything to square one until Holmes deduces that Roney stole a copper bowl from an archaeological site in Afghanistan and had an unknown accomplice kill Clennon and Monroe. She manages to get rid of the bowl without her noisy dog objecting to the visitor, which means it was her ex-husband, who never even showed up on screen. And Gregson decides to be nicer to his wife, so maybe they'll get back together.
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We open on a holding cell, which Holmes describes to Watson as "the human condition in all its sordid glory." Watson thinks this is a dumb way to spend a Friday night. Holmes disagrees, because Friday night means a full cell, and that means lots of opportunity to look at people and deduce how they got there. Watson does some deducing, but she gets stuck on a guy with a lot of tattoos. Holmes gives her a hint involving Yorkshire terriers, which annoys her. She goes off to get a coffee, and a man who looks like Eddie Pepitone asks to do him next.
At the coffee machine, Watson is interrupted by Craig Basken of the night shift. He wants help with a string of falafel cart robberies that have left him stumped. She takes the case and Craig stammers that Holmes once called him a bell-end. He wants just Watson on the case and she takes the files.
A woman gets home while talking to her child on the phone. The child hasn't called her back from college, so she's leaving a message. Before we can get farther into the situation and start having opinions on whether she needs to let her kids have some space, a man in a ski mask asks where her husband is. He's got a gun and was waiting in the dark. She says she doesn't know where her husband is. Then she hits the car alarm remote control in her hand, which sets off red lights and honking. Nice! While the intruder is distracted, she runs upstairs, slams the bedroom door behind her and gets a gun. She shoots through the bedroom door, then calls the police to tell them that she shot at an intruder and there's blood. She thinks he's gone now, but she wants them to check on her husband. He's with the 11th precinct: "He's the captain there. His name's Tommy Gregson." Why, that's Captain Gregson!
When Gregson gets to his home, police are already there so he's immediately told that his wife is in the kitchen. Bell is on the lawn, interviewing a neighbor who was working in his garage when the gun went off. Holmes gets there and Bell makes him wait a few minutes, because the Gregsons need some time alone before being interrogated. Bell has to repeat himself, but Holmes does, in fact, stay outside the house for the moment. Luckily, he has this neighbor to talk to. The neighbor's name is James Monroe and he's heard it all before: "Yes. Like the fifth president." By the time he got outside, the intruder was running down the street. But he'd taken his mask off, so he knows he had dark hair. Holmes says there's blood on the car over here. Watson speculates that he couldn't have lost much blood if he was running down the street.