He's a new Doctor, and she's a woman fighting for every breath. When a parasitic entity begins draining life from innocent victims, the Doctor and his new companion, Claire Holloway, are drawn into a cosmic mystery spanning all of time and space. Their search for The God leads them to The Bloomheart, an ancient force harvesting the vitality of planets and civilisations. As the universe faces its final gasp, the Doctor must decide if a single life-or a single world-is worth risking everything.