Di9: A secret U.S. intelligence agency established after 9/11 to protect the country against terrorist, cyber, and financial attacks. Operating on foreign and domestic soil, they are there when all other agencies can't get the job done. Bryce Stone is a family man and a detective for the MPD in Washington, D.C. After being recruited by his brother to work for Di9, he decides that he doesn't want to be out in the field to make sure he comes home safe to his wife and son. After just two weeks as an analyst his world is turned upside down.

When all of Di9's Agents on the scene, including Bryce's brother, are killed during an assassination attempt on the President of the United States, it becomes apparent a traitor is in their ranks. Bryce is forced into action and must track down the unknown attackers. Not only does he want to avenge his brother's death, but he has to stop them before an even bigger attack happens on U.S. soil.