Finn Silverweed has never felt he fits into the fishing community of Laggandall Bay. The uneasy truce between the fishermen and the patrolling navy subs is echoed by the tensions between Finn and his businessman father, who presumes his son will follow in his footsteps.

With a comet hanging like an omen over the bay, Finn starts to hear strange noises in his head - noises that draw him to the sea. But a disaster is coming that will threaten to sweep away not only Finn but his town as well . . .