Signal
(Book)

"In the middle of the night, ex-Special Forces operative Sam Dryden gets a urgent call from an old colleague, desperate for his help in a last-minute secret mission ... The two race to a remote shack in the foothills of the Sierra Nevadas, where they break in, rescue four kidnapped girls, then flee into the hills just seconds ahead of the arriving police and FBI team. It's then that Sam Dryden learns the real secret behind this mission: his former teammate has been working security for an old friend whose company discovered something, and developed a device around that discovery, which had the power to change the course of history"--,Provided by publisher.