Physicist Scarlett Stone is the daughter of the most notorious Russian spy in FBI history. With her father dying in prison, time is running out. Using a false identity, she gains access to the Russian ambassador's Christmas party, searching for evidence to prove her father's innocence. Former Navy SEAL, now FBI Special Agent, Matt Lazlo, is instantly attracted to Scarlett but when he discovers she lied to him about her identity, he hunts her down with the ruthless efficiency he usually reserves for serial killers. Not only does Scarlett's scheme fail, it puts her in the sights of people who reward unwanted curiosity with brutality. The FBI—and Matt—aren't thrilled with her, either. As the agents involved in her father's investigation start dying, and the attempts to stop Scarlett intensify, Matt and his colleagues begin to wonder. Could they have a traitor in their midst?