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A Treacherous Tide (Hardy Boys Adventures Series #21)

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Brother detectives Frank and Joe dive deep into the Florida Keys to find a missing person in the twenty-first book in the thrilling Hardy Boys Adventures series.

Frank and Joe Hardy have been invited to take part in a conservation mission by a marine biologist at the Bayport Aquarium. The boys get to go on an all-expenses paid trip to the lush and beautiful Florida Keys to help save sharks!

But the trip’s purpose is suddenly sidelined when a paddle boarder goes missing and rumors start that ...