In the first book in a thrilling new series, FBI Special Agent Meg Jennings and Hawk, her loyal search-and-rescue Labrador, must race against time as they zero in on one of the deadliest killers in the country . . .

Meg and Hawk are part of the FBI's elite K-9 unit. Hawk can sniff out bodies anywhere—living or dead—whether it's tracking a criminal or finding a missing person. When a bomb rips apart a government building on the National Mall in Washington D.C., it takes all of the team's extensive search-and-rescue training to locate and save the workers and visitors buried beneath the rubble.

But even as the duo are hailed as heroes, a mad bomber remains at large, striking terror across the Eastern seaboard in a ruthless pursuit of retribution. As more bombs are detonated and the body count escalates, Meg and Hawk are brought in to a task force dedicated to stopping the unseen killer. But when the attacks spiral wide and any number of locations could be the next target, it will come down to a battle of wits and survival skills between Meg, Hawk, and the bomber they're tracking to rescue a nation from the brink of chaos.