King and Chizmar join forces again with a powerful stand-alone novel that is also the final chapter in the Gwendy trilogy.

When Gwendy Peterson was twelve, a stranger named Richard Farris gave her a mysterious box for safekeeping. It offered treats and vintage coins, but it was dangerous. Pushing any of its seven coloured buttons promised death and destruction.

Years later, the button box re-entered Gwendy's life. A successful novelist and a rising political star, she was once more forced to deal with the temptations that the box represented - an amazing sense of...