Dreams From the Deep (Soul Survivors, #1)

Marketing assistant Cleona Mahoney survives a horrific plane crash only to discover that the buzzing sound she hears is not a concussion but the voices of people who died in the crash.
When she meets Kevan MacFinnin, their mutual attraction is swift and powerful, despite the disfiguring scars he sustained in the terrorist bombing that killed his parents. In recent months, several of Kevan's sheep have been sliced open and left on the hillside, the only clue being a mysterious symbol painted on the fleece.
After her communion with Earth's spirit reveals Cleona to be the Carrier of Life's Preservation, she and Kevan decode the revolutionary formula given to her by a solar scientist who perished in the crash.