The Fallen is the nineteenth episode of the fourteenth season of CSI: Crime Scene Investigation. It aired on April 2, 2014.
D.B. Russell is taken hostage after a teenager opens fire in a police station.
The episode begins with people standing in a long line at the LVPD front desk. D.B. walks over to Officer Deborah Hughes and receives the latest case file: A politician's new BMW has been destroyed by Jacob Baker, the teen who pointed lasers at airplanes in the episode "Keep Calm and Carry On." Deborah tells her husband, Officer Black Hughes, to cover the front desk. He starts arguing with his wife and D.B. tells them to "get a room." D.B. heads into the interrogation room to talk to Jacob.
The long line of people waiting at the front desk hasn't changed much. After Officer Hughes gives a older woman a clipboard, a teenager cuts in front of a young lady. Both the lady and the officer start yelling at him, but he pulls out a gun and shoots Officer Hughes in the chest. Everyone ducks for cover, but the teen takes the young lady hostage. Chaos breaks out in the LVPD: the teenager starts firing bullets, some of them hitting cops, others breaking glass. The teen drops the gun and pulls out another one. Once he reaches an interrogation room, he lets the young woman go. Shots are fired, but someone yells "Hold your fire, Russell's in there!" The teen points his gun at Russell, and now holds him hostage inside the room. (Jacob Baker was shot sometime in the chaos.)
Nick walks into a crowded room full of people (including Sara) watching the news about the hostage situation. When Nick asks what's going on, Finlay comes into the room and tells the two CSIs that she had just got off the phone with Brass, and that Russell is in the room with the shooter. Both Sara and Nick are shocked at the news.
Meanwhile, the cops are setting up bulletproof shields and are loading their guns. In another room, an officer is trying to load the interrogation room security camera feeds and Brass is talking to someone on the phone. One officer is dead, and four others are wounded. Deborah comes into the room, saying that Brass had wanted to speak with her. He tells her that her husband was shot because he was at the front desk when the shooter came in. She blames herself because she was the one who put him there. Brass tells her to go to the hospital and visit him. Brass dials Russell.
In the interrogation room, Russell's phone is ringing and Jacob is screaming in pain from the bullet wound. When Russell tries to help Jacob, the teen with the gun becomes angry and tells him to get back against the wall. Russell tells the teen that he needs to answer the phone, but he won't let him. Russell tells him that the cops will "light the place up." The teen replies "maybe that's what I want."
Nick asks Brass if he could get a hold of Russell. Brass tells him no.
Jacob starts complaining that the room is cold, and Russell tries to help him once again. The teen with the gun becomes angry and tells him to get back against the wall, but Russell tells him that he needs a doctor. Both D.B and the teen start yelling at each other, and the teen reluctantly lets D.B. help Jacob. D.B. takes off his jacket, rips it in half, and ties it around the bullet hole to stop the bleeding. Russell tries to learn the teen's name, but to no avail.
In the other room, Brass asks the officer how the security cameras are coming along, but only the picture quality is going to work, there will be no sound. Brass's phone rings and caller ID reveals that Russell is calling. Brass answers it and the camera feed pops up on the computer screen. After some talking, the teen says he wants a laptop.
In the morgue, Doc Robbins is working on taking the bullets out of one of the officer's body. His assistant shows him and Morgan a picture of the family: a wife and four boys. The family had not been notified of the situation. After one of the bullets is removed, it is revealed to be a 9 mm, and Morgan hopes that the bullet and gun will help ID the shooter.
Sara visits the hospital and finds one officer getting cleaned up and a lot of bloody clothes and towels on the floor. She hears Deborah screaming for her husband. Sara tells her that he had gone into surgery and that she should receive news soon.
Jacob is complaining of a lot more pain. D.B. tells him that a medic is coming very soon.
Greg is watching the security camera when Brass enters and tells him that the building has been cleared. An officer comes in with an epinephrine pen that has a microphone hidden inside it, so that they can hear what's going on.
Greg heads to the interrogation room with a large bag and laptop. Suddenly, a red laser shines on him. The teenager is holding D.B. in a headlock. The teen carefully instructs Greg to set down the supplies, and turn around slowly. Greg tells him that he is unarmed. The teen points his gun at D.B. and tells him to go get the supplies, otherwise Jacob was going to get shot again. D.B. gets the supplies, but it's too slow for the teen so he starts shouting "What's the holdup?"
Morgan and Finlay are looking at the bullets recovered from the officer's body. Morgan reveals that the gun came from Arizona, but doesn't understand how it could end up in the hands of a kid shooting cops inside the LVPD.
The teen is busily looking at many different things on the laptop. D.B. thinks that he is looking for himself on the news.