A young boy discovers a clue that points to an incredible treasure… When Miss Eells gives young 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 joke left by the odd, old Winterborn before he died. But then why do things suddenly start getting so strange? And terrifying? This first book in John Bellairs’ Anthony Monday Mystery series will have young readers on the edge of their seats, desperate to race ahead the story’s final surprise.

When Anthony Monday stumbles upon the diary of J.K. Borkman, he thinks he's unearthed a worthless piece of junk. But Borkman's mysterious writings turn out to be much more—plans to turn the world into an icy wasteland. By the time ghastly weather sets in and Anthony realizes it's Borkman's fanatical son who is bent on carrying out his father's horrific work, it may be too late to stop him.

Anthony Monday and Miss Eells recover a magic lamp that was stolen from a warlock's tomb and is spreading evil to further the wicked ends of the thief.

While spending the summer in an old house on a desolate Canadian island, Anthony Monday and Miss Eells discover a chest that can transport them to another world and a maniacal group who are plotting the destructon of people on Earth.