Trouble with treasure

"Violet and Wally discover an old chest hidden in a sea cavern. In order to uncover who put it there and why, they'll have to figure out how to open its rusty lock"--Back cover.

9781524855727
book
Lexile: 
690

Holdings

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4062791729046724408887261011541GCAS211GCAS002628FIC CAR100017425694091742569409