When seven-year-old Kaia's sandcastle engineering keeps failing and five-year-old Zuri discovers mysterious symbols in their grandmother's jewelry box, they unlock a family secret spanning millennia. Their beach creation becomes a magical portal connecting them to treasure-keeping children across history-from Olympic Greece to Viking harbors, Medieval Venice to Feudal Japan, Caribbean pirates to Gold Rush California. As they learn that their family has protected magical treasures for generations, they must use engineering precision and friendship magic to defend the ancient tradition from those who would steal it. An unstoppable adventure combining time travel, family heritage, historical friendship, and the transformative truth that children have always been the rightful inheritors of their families' most magical legacies.
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