Book excerpt: The Doctor is the last of the Time Lords, travelling along through time and space. Able to regenerate, and live many lives, the Doctor is a hero to the helpless. Doom is the universe’s greatest assassin, currently traversing all of time and space in pursuit of the Doctor, who is the only one who can save her from the ever-approaching Death. She has just 24 hours and a vortex manipulator to save herself before her fate is sealed forever…