Signal
(Book)

Through their actions, Sam Dryden and FBI agent Marnie Calvert have unknowingly placed themselves in the cross-hairs of a frightening and dangerous enemy, the result of a generations-long conspiracy finally coming to fruition. What these people have is a technology that allows them to affect events before they even happen. How they are planning to use it, however, will result in the death of millions. To defeat them, Dryden will need to do more than think fast--he'll need to think around corners, and face down an enemy that can seize on his mistakes before he even makes them. --Provided by publisher.