When the bodies of four teenage girls, are found tied to a rope and floating in the lower Niagara River, the best investigator in the county, police officer Alec Theron, takes on the case. Theron fights a shadowy organization whose main activity is human trafficking for prostitution, using the Niagara River along the Canadian-American border. The evidence points to a fifth girl who survived the drowning and is out there somewhere. Theron suspects that she fears she will be caught by the smugglers and killed, but she's more afraid that she will be found by the authorities and sent back. Theron finds the girl and she is able to identify the men who drowned her friends. The girl leads him to the criminal organization. Theron's investigation uncovers the secrets of this organization and threatens to topple the empire they've built and run for decades. Theron collides with the criminals in the rapids above the roaring Niagara Falls. The climax takes place in the rushing water, literally feet from the brink of the falls.