Trama

When Zephyr, a savvy and free-spirited surfer, is abducted by a shark-obsessed serial killer and held captive on his boat, she must figure out how to escape before he carries out a ritualistic feeding to the sharks below.

Tourists Greg and Heather visit Tucker's Experience, a shark cage attraction run by the eccentric boat captain Tucker. While riding out into the ocean, Tucker remarks on how he survived a shark attack as a child, which scarred him and changed his view of the species. After the two participate in a cage dive, Tucker suddenly kills Greg and abducts Heather.

At the Gold Coast, American drifter Zephyr reluctantly helps real estate agent Moses start his car. The two bond over their love of surfing and later have a one-night stand. Although Moses hopes their relationship turns into something romantic, Zephyr drives away later that night without him to surf. There, she encounters Tucker, who abducts her. Moses arrives at the surfing spot the next morning but finds no sign of Zephyr. Zephyr awakens chained to a bed in a room where Heather is also being held. Upstairs, it is revealed that Tucker is holding the pair captive in his boat. Zephyr discovers he has done this to other women and is unsuccessful in attempting to lock pick her cuffs.

That night, Tucker drugs Zephyr and Heather. The two awaken on deck. Zephyr is strapped to a chair and watches helplessly as Heather is hoisted into the air by a harness and hovered over the water, which is filled with sharks lured by chum. Tucker sets up an old VHS camera to record as Heather is lowered into the water and devoured by sharks. It is revealed that Tucker is a serial killer who has done this to multiple tourists. The next day, Zephyr's van is towed away, causing Moses to be suspicious of her whereabouts, and he begins to look for her. Zephyr manages to escape the room. While being chased on the deck, she throws his camera overboard in the scuffle before being recaptured. Furious, Tucker returns to land and docks his boat before going out to buy a new camera.

Recognizing Tucker's van on a live webcam feed of the beach Zephyr vanished from, Moses goes to visit him, unaware he has left. He sneaks onto the boat, and he hears Zephyr's screams and discovers her. Zephyr instructs him to call the police. As he does so, Tucker returns and attacks him. The two fight before Moses is knocked unconscious by Tucker's neighbor, Dave, who has been sending tourists to his cage experience, unaware of the murders. When Dave hears Zephyr's screams, Tucker kills him. Tucker drives the boat out to the ocean and puts Moses in the harness. Moses follows Zephyr's advice to stay still and is unharmed by the sharks. Tucker stabs Moses repeatedly in the stomach to lure more sharks, but is forced to get everyone back inside the boat when a lifeguard helicopter passes by.

While Tucker waits for the coast to be clear, Zephyr makes another escape attempt after biting her thumb off. She and Tucker have a scuffle with Zephyr getting drugged in the process. She jumps into the water and attempts to swim to shore, where a wedding reception is taking place. However, she is pursued by Tucker on a dinghy and brought back to the boat. She and Moses awaken on deck, with Zephyr now in the harness. As she is lowered into the water, a huge great white shark arrives, scaring off the other sharks and starts prowling the area. Zephyr frees herself from the harness and falls into the water. There she comes face to face with the great white, and it swims off. Zephyr then climbs back aboard Tucker's boat. On the boat and with Moses near death, Zephyr shoots Tucker with a spear gun. Tucker falls into the ocean and is devoured by the shark. Zephyr signals a passing boat for help, and she and Moses affirm a future together. Courtesy of Wikipedia.