Anthony Monday doesn't have many friends, and his home life is a wreck. But, he does have Miss Eells, the librarian at the Hoosac Public Library, and he has an adventure waiting for him right around the corner.When Miss Eells gives Anthony a job at the library, he thinks he'll just be dusting shelves and filing books. Instead, he discovers a hidden clue leading to the treasure of eccentric millionaire Alpheus Winterborn. Miss Eells thinks the clues are a practical jokes left by the odd, old Winterborn before he died. Then why do things start getting so scary so quickly? The closer they get to solving the mystery, the closer Winterborn's evil nephew Hugo Philpotts lurks in the shadows, waiting to snatch the treasure out of their hands.