Kaitlin Reyes is undercover trying to infiltrate a drug smuggling cartel in the Seattle/Pacific Northwest area. She is tasked to dive to retrieve evidence in the murky waters and figure out just who is at the top of the smuggling chain. During the course of her investigation, she is joined by Graham McKenzie, an operative from the agency, who is assigned to back her up. Together, they discover that the very agency they work for may very well be assisting the smugglers. Her investigation takes her through the Pacific Northwest to Alaska to Ireland and finally back to Washington State. All the while she must dive in waters that are filled with as many currents of deception as the investigation itself.