Rutherford, Mara. Crown of coral and pearl (Series)

When Sami invites Zadie to explore a sunken ship with him, she immediately jumps at the opportunity. After all, discovering treasures in the depths of the ocean could provide Zadie with enough money to buy the boat her family desperately needs. But swimming in open water can be dangerous, particularly when the hunt for gold serves as a distraction… Books in the Crown of Coral and Pearl duology: Crown of Coral and Pearl Kingdom of Sea and Stone

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