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Frank and Joe have been hanging out at Sir Robert’s Comic Kingdom, the local comic and gaming shop, and got the exclusive invite to this year’s Halloween costume ball at Bayport’s one and only castle. Sir Robert plans to use the big event to unveil his most prized possession, a super rare comic that is rumored to contain a map to buried treasure.

Sir Robert agrees to show his store regulars—who now include Frank and Joe—a sneak preview of the comic before the party. But when he goes to unlock the fireproof casing, he finds the book is gone.

It will take all of Frank and Joe’s recently acquired LARPing skills to solve this case. Anything can happen in a castle full of dungeons and deception. Can the Hardy boys keep up?