When Vivian Steele, an attorney at the State Department, witnesses two ambassadors collapse as if poisoned at a diplomatic dinner in Washington, DC, she is recruited to be a member of a joint FBI task force assigned to investigate. But she soon finds her by-the-book ways clashing with a special agent in the Diplomatic Security Service, Jacob Cruz. A former Navy SEAL and in charge of the event's security, Jacob takes the attack personally and is driven to act quickly, unhampered by rules and regulations.