The Day of the Triffids
What is The Day of the Triffids about (plot, summary)
A meteor shower blinds nearly the entire population of Earth and Bill Masen believes himself to be the last sighted person on the planet. Triffids are a mobile, carnivorous plant that Bill cultivates for their oil. When the Triffids get loose and are released on the blind population, they begin to feed on and kill the helpless humans.