Winter

From the front flap of the Macmillan hardback: "Only courage can save their lands - Storms rage as the worst winter in living memory ravages the human and Hydden worlds. The prophesied End of Days is here and the universe is dying, yet only a few are even aware of the forces at work. Jack and Katherine must help their friend Bedwyn Stort halt this chaos by locating the last gem of Winter, something only he can do. Then it must be returned to the Earth's unwilling guardian, their daughter Judith. She will need the gem to try and reignite the fires of the universe. Yet Stort is riddled with uncertainty. He yearns for Judith, as she does for him, but a love between mortal and immortal cannot be. To find the gem, he must solve this conundrum and vanquish death itself. But can he really lead mortalkind to salvation?"