FBI Special Agent Ava McLane solves crimes she doesnt witness them. When shes trapped in a mall without her weapon as a shooter picks off victims, she hides with a wounded teen and prays for her survival.But thats only the beginningAn epidemic of mass shootings has has swept across Oregon. The young shooters terrify the public, committing random murders before taking their own lives. The task force assembled to solve the casewhich includes Avas boyfriend, detective Mason Callahanremains stumped. And on top of this chaos, Avas troubled twin sister reappears, throwing Avas already-tumultuous life into a tailspin.An old-fashioned cop with a strong sense of duty, Mason struggles to find the cause of the shootings as workaholic Ava spins ever closer to breaking down.