Gwendy's Final Task is a wildly suspenseful and at the same time deeply moving novel in which 'horror giants' (Publishers Weekly) Stephen King and Richard Chizmar take us on a journey from Castle Rock to another famous cursed Maine city to the MF-1 space station, where Gwendy must execute a secret mission to save the world. And, maybe, all worlds. A powerful stand-alone novel that is also the final chapter in the "Gwendy" trilogy.