The Light Fantastic: Discworld Novel 2

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'What shall we do?' said Twoflower. 'Panic?' said Rincewind hopefully. He always held that panic was the best means of survival. As it moves towards a seemingly inevitable collision with a malevolent red star, the Discworld could do with a hero.

What it doesn't need is a singularly inept and cowardly wizard, still recovering from the trauma of falling off the edge of the world, or a well-meaning tourist and his luggage which has a mind (and legs) of its own. Which is a shame because that's all there is...