During a marine biology lesson at Mouseford Academy, the Thea Sisters learn about a mysterious shipwreck off Whale Island. According to legend, a very rare diamond called Jasmine's Heart was on the ship when it sank. When biology teacher Professor Van Kraken disappears, the Thea Sisters have... read more
Preceded by Thea Stilton and the Mountain of Fire, and followed by Thea Stilton and the Mystery in Paris.
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