Former Marine sniper Seth Harlan is new to HORNET and anxious to prove he can still do his job despite an ongoing battle with PTSD. He remembers all too well what it's like to sit inside an enemy camp, praying for rescue and waiting for death, so when a wounded veteran contacts HORNET to rescue a buddy that got left behind, all sorts of nasty memories strain his newfound stability.
An interview with a runaway Afghani child bride leads photojournalist Phoebe Leighton to an arms deal involving a suitcase bomb powerful enough to wipe out a mid-sized town, and she realizes this is one battle she can't win on her own. Forming an unlikely alliance with a ragtag team of military and government delinquents, she meets Seth, a sniper carrying as many emotional scars as physical, who impresses her with his steely will and ignites passions within her she thought long dead.
Suddenly this mission is about a lot more than an abandoned soldier. Racing against the clock, Seth, Phoebe, and the rest of HORNET struggle to stop that bomb before it reaches its final destination: The United States.