Book parameters:
Size 215 x 280 mm, 32 pages, hardcover
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Arabic, Bulgarian, German, Greek, Italian, Lithuanian, Polish, Romanian, Russian, Simplified Chinese, Spanish, Turkish, Ukrainian

Ever since they were reunited, Gerda and her once-lost brother Lars have joined voices to sing the lullaby their mother taught them when they were baby whales. One day, brother and sister learn that the song is longer than they thought, and, countering their fear of the unknown, they set off in search of the rest of it. On their way, they have surprise adventures and get to know many inhabitants of the undersea world. But will they manage to find the missing verses of Mum’s song?