Every evening Lampie the lighthouse keeper's daughter must light a lantern to warn ships away from the rocks.

But one stormy night disaster strikes. The lantern goes out, a ship is wrecked and an adventure begins. In disgrace, Lampie is sent to work as a maid at the Admiral's Black House, where rumour has it thata monster lurks in the tower.

But what she finds there is stranger and more beautiful than any monster. Soon Lampie is drawn into a fairytale adventure in a world of mermaids and pirates, where she must fight with all her might for friendship, freedom and the right to be different.