In this 14th book in the Key Mystery Series, Mandy, Nick and friends are hunting for a legendary pirate treasure in Machiasport, Maine. Along with Noah's parents on their boat, the Lucky Lucy, they search the inland waterway for a likely spot for the stash. Rumor has it the loot is somewhere nearby-buried in an underground wooden vault. When they start getting close, they are threatened by modern day pirates who are determined to find the treasure first, at any cost. The children learn about Sam Bellamy, the richest pirate of all time, and the tragic wreck of his ship the Whydah in 1717. Does the key they find belong to him? Who is watching them? And most of all, will they survive the escalating sabotage and danger to find Black Sam's treasure, or will it be the end of them? The Lost Pirate's Key, a story of suspicion and suspense, peril and persistence, will keep 8-12 year-olds reading until the surprise ending.