Lisa Palmer has barely recovered from the sudden death of her husband when she is drawn into a new nightmare. On her way home from upstate New York, Lisa stops at a service center minutes before an armored car heist. Four men are executed before her eyes-one, an off-duty FBI agent she tried to help. Now Lisa is the FBI's secret witness and the key to finding the fugitive killers. FBI agent Frank Morrow leads the investigation of the high-profile case. Hiding a very personal secret, Frank knows this assignment will be like no other he's ever faced ... and it could be his last. Pressured to land an exclusive, journalist Jack Gannon chases the elusive thread of an anonymous tipster. With every instinct telling Jack the story is within his grasp, he risks everything to reveal the chilling truth ... before the cold-blooded killers can take the next step in their vengeful mission.