The summer Natasha Rothwell turns fifteen, strange dancing lights appear in the sky above her small town, lights that she interprets as portents of doom.

Natasha leads a sheltered life with her beautiful, bohemian mother in a crumbling house by the sea. As news of the lights spreads, more and more visitors arrive in the town, creating a feverish atmosphere of anticipation and dread. And the arrival of a new lodger, the handsome Mr Bowen, threatens to upset the delicate equilibrium between mother and daughter.

Then Natasha's fears seem to be realized when a local teenager goes missing, and she is called on to help.

But her actions over that long, hot summer will have unforeseen and ultimately tragic consequences that will cast a shadow for many years to come...