Mystery of Smuggler's Cove — Franklin W. Dixon

A painting is stolen, and the Hardy Boys are suspects. Determined to find the artwork, the young detectives fly to Florida, where they disguise themselves and join a group of sinister smugglers. Though the painting fails to appear, an important clue sends the boys on a perilous trek through the Everglades. Threatened at every turn by greedy enemies, the Hardys fight a tricky and powerful battle to expose the truth.