On a calm moonless night, a Singapore airliner carrying several hundred passengers, including twenty of America's top scientists and engineers, disappears over the Indian Ocean without a trace. Then one day an Enigma agent hiking through the Siberian forests of Russia, finds one of the scientists...alive.

Petrov hates Enigma, the secret intelligence organization that nearly destroyed his life, but duty drives him to inform the US Government he has located the missing scientists. Time is running out to orchestrate a rescue mission and destroy the technology given to the Russians. Petrov's prize is reuniting with Tessa Scott, who he met in Afghanistan two years earlier. He has no qualms about destroying the one person who stands in his way, Captain Chase Hunter.

With her marriage on the rocks, Tessa decides to travel to Russia to assist the new ambassador. Change gives her clarity of what the future will hold as a single mom. When Petrov finds her in the clutches of a sadistic Russian general, she is more than willing to follow him into the wilds of Siberia. But at what cost?

Captain Hunter and his team design an escape plan for the American scientists and hope they don't start WWIII in the process. Forced to put his hatred of Petrov aside, they work together to ensure military superiority stays in the hands of the US. He soon learns the cost of doing business with his enemy, might mean losing Agent Tessa Scott.