High frequency

"She's an award-winning investigative journalist. He's a reporter for a sensationalist tabloid. They meet over a boring story about crop circles that turns into a harrowing life-or-death race through England, a secret room at an Air Force base, and a weapon aimed at Washington, D.C. As bullets rain down, crop circles multiply, earthquakes shake London and lightning strikes more than twice; they are forced into an uneasy and very untrusting partnership. Add in one con-man and a few good Druids and they might save the world, if they don't kill each other first" -- Amazon.com summary.