On a snowy night in December, former NASA engineer Ian Higgs is shot in cold blood on the streets of London, his death drawing the attention of governments on both sides of the Atlantic. Compounding the mystery, his daughter, Amanda, receives an ominous letter that her father mailed to her on the day he was murdered. Amanda is sure that clues contained in the letter will lead to her father's killer.

The United States government, with its own interest in the matter, turns to the Delphi Group. Senior operative Zane Watson is called out of hiding from a black site in Colorado, and the team uncovers a series of clues that leads them across Europe, from a luxury apartment in Vienna to an ancient cathedral in Geneva. In the process, they uncover a sinister plot to harness the power of modern technology toward supernatural ends. The team must race against time to protect civilization from an evil not heard of since the dawn of recorded history.

With the clock ticking and a blizzard raging outside, the forces of good and evil collide at a world-renowned scientific facility. At stake is nothing short of the future of mankind.