Gwendy's Final Task

Gwendy's Final Task, the concluding installment in the Gwendy's Button Box trilogy by Stephen King and Richard Chizmar, follows Gwendy Peterson as she grapples with the dangerous allure of a mysterious, powerful box. As malignant forces seek to claim it, Gwendy must undertake a secret mission across various locations, including space, to prevent catastrophe and protect the world from destruction.