A mysterious kidnapping

On a hot summer night, a scientist from the Centers for Disease Control is grabbed by unknown assailants in a shopping center parking lot. Vanished into thin air, the authorities are desperate to save the doctor.

A devastating explosion

One month later, the serenity of a sunny Sunday afternoon is shattered by the boom of a ground-shaking blast—followed by another seconds later. One of Atlanta’s busiest and most important neighborhood’s has been bombed—the location of Emory University, two major hospitals, the FBI headquarters, and the CDC.

A diabolical enemy

Medical examiner Sara Linton and her partner Will Trent, an investigator with the Georgia Bureau of Investigation, rush to the scene—and into the heart of a deadly conspiracy that threatens to destroy thousands of innocent lives. When the assailants abduct Sara, Will goes undercover to save her and prevent a massacre—putting his own life on the line for the woman and the country he loves.

I'm actually giving this "only" a 7 because the beginning was very slow and it annoyed me the repetition of facts just because they were being reported through different character eyes - it didn't stop them from being a repetition!
But then the story really speed on, with very dark and very real situations. This presents a very frightening reality, and we don't have a happy ending for all.
Nice to see Sara and Will's relationship finally moving forward.