A New York Times Bestseller! By the author of The Mysterious Benedict Society, this heart-pounding mystery adventure is laced with magic and humor.

When Reuben discovers an extraordinary antique watch with a secret power, his life takes an intriguing turn. As one secret leads to another, Reuben finds himself torn between his honest nature and the lure to be a hero.

Now he is on a dangerous adventure--full of curious characters, treacherous traps, and hairsbreadth escapes--as he races to solve the mystery before it is too late. With fearless Penny, mighty Jack, and the wise Mrs. Genevieve on his side, can Reuben outwit a sly villain called The Smoke and save the city from a terrible fate?

In this ingeniously crafted novel, acclaimed author Trenton Lee Stewart invites readers to join the adventure, decipher the clues, and ask themselves the question: Is knowing a secret a gift or a curse?