Imagine living on a planet with six suns that never experiences Darkness. Imagine never having seen the Stars. Then, one by one your suns start to set, gradually leading you into Darkness for the first time ever. Image the terror of such a Nightfall. Scientists on the planet Kalgash discover that an eclipse - an event that occurs only every 2049 years - is imminent, and that a society unfamiliar with Darkness will be plunged…