When Elsa's father is killed in a tornado, all she wants is to escape. For years she has been haunted by a sight once seen from an aeroplane: a tiny, isolated settlement called Thunderstown. In Thunderstown, they say, the weather can come to life and when Elsa meets Finn Munro, an outcast living in the mountains above the town, she wonders whether she has witnessed just that. For Finn has an incredible secret, he has a thunderstorm inside of him. Not everyone in town wants happiness for Elsa and Finn. As events turn against them, can they weather the tempest - can they survive at all?