The episode starts with a lot of people gathered around a dead dolphin. Mitch and April arrive in a lifeguard truck and Mitch lets April transport the dead dolphin to the Marine Lab. Later some drug dealers make a deal on the beach. Behind some bushes, Garner Ellerbee is sitting on a horse named Earl, watching them. When the deal has been made, Garner starts riding towards the drug dealers. Two of them drive off on ATVs, and the third one disappears on a wave-runner. During the chase, Garner passes the tower where Mitch and April are talking. They join him for the chase in a lifeguard truck. Garner and Mitch capture the drug dealers and Mitch and Garner catch up on their lives together. It turns out that Garner now works for the Federal Police Unit. They are drug traffickers on the beach, trying to find suppliers. Garner tells Mitch about the drug smuggling ring that is operating off the coastline. In order to mark drug drop sites in the ocean, the drug dealers use a phosphorescent chemical. They later find out from the Marine Lab that the dolphin died from the same chemical. Now Garner needs Mitch´s help to bust the drug dealers. When Neely is on duty, a handsome man named Mike Donovan approaches her. He wants her to join him for a party at his yacht. She accepts his offer and brings Mitch and Garner to the party as well. During the party, Garner recognizes Donovan as the head drug dealer. And Garner suddenly realizes that Donovan´s yacht must be the base for the drug operation. When they tell Neely how dangerous Donovan is, she just tells them that she can take care of herself. At night, Mitch and Garner go to the yacht to snoop around. They find the phosphorescent chemical that killed the dolphin. Mitch gets a sample of it just before Lukas, Donovan´s bodyguard, spots them. Mitch submerges and Garner speeds away in the zodiac. But before Garner has time to leave, Lukas recognizes him. When Garner tells Mitch that he has told Neely to plant a transmitter on the yacht, Mitch gets angry because he is worried about Neely. When Neely is left alone on the yacht, she plants the transmitter. When Lucas has told Donovan about Neely´s two friends, Donovan decides to keep Neely prisoner. Lucas goes through her purse and when he doesn´t find anything, he goes through the yacht and eventually finds the transmitter. When the transmitter has been turned off, Mitch and Garner know that Neely is in danger. Neely is forced into an inflatable raft and is left for the sharks. Lucas punctures a large hole in the side of the raft. When Mitch, Garner and the Coast Guard arrive, Donovan´s partners are captured. Then Donovan double-crosses Lucas and drives off in a small boat. He is chased by Mitch, Garner and the Coast Guard. Mitch sees Neely and dives off the boat to rescue her. Donovan is surrendered and is forced to stop. In order to rescue Mitch and Neely from the shark, Garner has to use a lasso and throw it to them. Then he is able to pull them back to safety. Meanwhile, Lani has gone to see a doctor. The doctor is going to test her hearing to find the range of sound. But Lani doesn´t hear anything and is devastated. Later outside headquarters, a truck almost runs over Lani because she can´t hear it. Barnett rescues her just in time. When she is watching a movie at headquarters, she can´t hear anything and turns up the volume more and more until Cody runs over there to turn off the TV. Later Lani hers voices that aren´t there. Then suddenly when she is walking on the beach, she hears a little child crying. She knows that she has gotten her hearing back and is very happy about it.