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Segredo na praia (4 Gémeos, 3) (original 1961; edition 1984)
The Secret at the Seashore by Laura Lee Hope (1961)
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Wikipedia in English
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Strange things happen when the twins spend a summer at the seashore: a bottle is washed ashore containing a message from someone marooned on an island, boats vanish, and a thief steals a sackful of $100 bills.
(summary from another edition)
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