hen Marshall and Simon investigate an old haunted mill they discover that it's just a hoax, set up by a mysterious boy with gray hair. But then the three of them uncover an old rusted gun and the ghost of Grungy Bill, Eerie's worst bank robber, who failed to rob the Eerie Bank 13 times (the last time, he forgot his gun). Bill is doomed to haunt the old mill forever, unless Marshall can help him to successfully rob the bank.

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