Kaitlin, an undercover operative for an international agency, is assigned to investigate an alleged drug distributing ring in the Seattle/Northwest area of the United States that may have international connections. At the same time, she is asked by a friend to see if his sister, Sadie, might be invoked. Kaitlin must befriend Sadie and ultimately find her killer. Kaitlin's skills at diving and investigating are put to the test when she begins diving in the strong currents of the Pudget Sound during her investigation, and in the process discovers that the currents of the waters are not the only currents swirling around her that dangerous. Aided by Graham, an operative sent to assist and possibly spy on her, Kaitlin must solve the issues of the investigation while trying not to be killed by those she trusts in the process.