A pair of children befriend an eccentric old man, who lives isolated on the far shore of their island home. But it turns out that the old man knows a terrible secret about the island and the whales who sometimes come. Meanwhile WWI is making life hard in the village.

露西是个活泼的孩子，拥有超乎常人的天赋，这让她在锡利群岛的渔民中间显得格格不入。尽管阿尔菲一家给了她无微不至的关爱与温情，却仍无法让她免受那些由她不知不觉间引发的流言蜚语和迷信偏见的侵扰。当露西遇见一个神秘女孩米莉时，她便踏上了一场不可思议的追寻之旅，试图找到自己真正的身世根源。