It's a difficult time for fifteen-year-old Savannah Grey - she's settled into her latest foster placement, but her body is acting strangely.

Then other strange things begin to happen: nature, it seems, is exerting an overpowering force on the world.

Birds behave erratically; gusts of wind blow leaves so fiercely they seem to lure people away. And Savannah discovers she has supernatural powers. Meanwhile, she feels drawn to the new boy Reece whose life is even stranger than hers.

Quickly Savannah and Reece realise that nature has a purpose for them both.

For they are on course to meet the vile and evil Ocrassa, who wants to destroy the world by corrupting nature. And it wants Savannah Grey to help realise its savage intent.