CSI: NY

There is a huge dig (construction) happening under the city. The men get ready some explosions and leave on a lift. Upon returning to the site, they find a dead man. Danny and Mac arrive on scene. The man had no protective wear. He wasn't doing what he was supposed to be. So they head down and take pictures of the crime scene. Mac covers his hands with bags, as there is possible trace, while Danny does some investigating. They head to the lift with the body and see the DA there who tells them they need to hurry. It isn't good to keep the water line.
Flack and Mac question the other workers. The dead man, Pete Riggs was an above ground worker. He wasn't supposed to be down there.
Aiden and Stella are at the crime scene of a woman, she was washed up on shore. Strangulation marks. She is very young, 16, her name is Hannah. She has expensive clothes on her. Goes to school on the UES and lives in Bronxdale. This is a little odd, as she comes from a poor family but went to an expensive school. They head to the school and question her friends. They find a polo with a label cut. She was pretending to wear expensive clothing.
Mac is examining his victim's body. He washes it off. Danny joins him. Trace came back, just construction trace. There is a wound on his head and many fractures and broken bones are on his body. His official cause of death was asthma. He died before the explosion.
Danny and Mac head back to the site and they search. They find evidence of his struggling walk, and then also find his inhaler. They notice scratch marks on the lift. He was trying to get back on and fell. Someone left him down there intentionally, and as Mac says, "he knew he was going to die. Alone."
Back at the morgue with Stella, Hawkes and Aiden: on their victim, there are no signs of sexual assault; Tox shows she had a high BAC. In her throat they found some gold flakes. They get her clothes. It is the real deal.
Danny and Mac are again at the site, questioning the workers, including the vic's brother. They finish with the foreman. He gets the clothes they all wore that day. They return to the lab and test the man's clothes. Danny suggests the brother has something to say: he is hiding something, but Mac suggests they see what the evidence has to say first. Danny finds blood on a boot and they send it to DNA.
Aiden is examining the marks on Heather's neck. The ligature marks on her neck are alligator skin. The gold flake in her throat is most likely debris from the river. Stella has diatoms: phytoplankton. So they find where she entered the water from what they absorbed. The diatoms are toxic.
Mac is looking at the x-rays of Pete's hand. The fingers are horribly broken. The blood on the boot of one of the workers (Al Mcgrath) was Pete's. He claims the blood got there after he punched Pete for insulting the Rangers and claims the bite in his ear was from Pete. When they say Pete was left down there purposefully, he sounds shocked, stating that they look out for each other. Danny and Mac find out the bite wasn't Pete's, so they take bite impressions of everyone. The bite is from another worker. Mac says, "this isn't just a murder anymore, it's a conspiracy."
They interview the man who gave the bite: Tom Zito, who had previously received an injury on his head because of a mistake by Pete Riggs (who happened to drop something on his head, which caused him to change clothes). It caused him to lose time from work, and his family. He didn't remember biting Al.
Aiden and Stella find the location where Heather was dropped off. They find the illegal dumper of Whiteridge Enterprises. Its neighbor is a bar, that is owned by the brother of her friend, Tina Paulson. They see a picture with Heather and Tina's brother.
Danny had brought back some trace from one of the shirts Mac cut (the foreman's). It has material from asthma medication on it. They bring him in for questioning. He states how careless he was and how he had just been making a point with the inhaler. They leave him and Mac explains how he was one of them. A part of the group and they defend the members of their group. Danny is still claiming the brother had been backing his brother and that he will come forward with information.
Aiden and Stella question the brother, Matt. He claims they never came in the bar, and were underage. But they can tell he's lying. They ask to check his camera, but his camera is not plugged in. So what do the girls do? They get the neighbors surveillance. They see Tina on surveillance. Then at another moment they find Matt kissing Hannah and a girl walking in on them kissing. He lied to them.
Aiden and Stella go to his home to question him. He states his father died, and the duplex was left to them. They confront him about lying. He states that she had a little crush on him and it was no big deal. Stella sees a riding crop. And Hannah being "blooded" (a term from fox-hunting). Tina comes and explains the situation. She says they had gone to a fox hunt. Tina says the crop was given to Hannah by her father, but that she didn't want it.
Danny is looking at the pictures of all the suspects. And Danny is getting frustrated. Mac is telling him he doesn't see the connection. He is reminding him he needs to look at the evidence, and not consider intuition. So they now have to see who did it. They go to the brother, who was in the hospital, he got beat up. He says it's over, and is going back to work. They go back to Hawkes and check the breaking of the fingers on the hand. It's different than the rest. There is an area on the finger that shows where a ring was.
Stella and Aiden are checking the surveillance footage of Matt and Heather kissing. They find out the person who walked in on them in the back was Tina. And that her purse there had a strap. But in the previous footage they found there was no strap, but it was the same bag. They realized they were looking at the timeline as backwards. She had used the strap to strangle Hannah. Tina says how she got her to go to England because she thought it would be good for her. She was saying how the handle was from the fox. And Stella points out how it was Hannah who got the blooding rights and not his own daughter. There is a flashback with Tina strangling her. Tina ends by saying how her father told her stories he had with hunting. And says what he remembered most was "There's no feeling in the world like watching the life drain out of an animal's eyes" which shows she always thought of Hannah as a pet, a dog she can train.
Danny and Mac go back to the site to look for the ring. They find it with a fingerprint on it. They realize the explosion was to cover up the evidence. The fingerprint was the brother. He did it to teach his brother a lesson. He dumped him down on the ground and yells, "if you wanna earn this, you gotta spend some time down here." He was sick of him messing things up. But his brother died, so he had to cover it up.