Mercer immediately retraces Jacobs's tracks, searching for clues to the secret project on which the distinguished scientist was working. Staying one step ahead of a highly trained team of assassins, Mercer follows a trail that leads from a harrowing close call in the Midwest to a nail-biting showdown in the rugged mountains of Afghanistan to a remote island in the middle of the Pacific. At stake is an extraordinary scientific discovery that could irrevocably alter the planet, centred on a cache of rare crystals called lightning stones - rumored to have been aboard Amelia Earhart's plane when it vanished on 2nd July 2 1937.