Night of the Big Heat is a science fiction novel written in 1959 by John Lymington. It tells the story of an unnamed British island that is experiencing a bizarre and stifling heatwave.
The main characters are Richard Callum, a former novelist, and his wife Frankie, who own a pub called the White Lion. Richard hires a secretary, Patricia Wells, to assist with his new book, but she becomes obsessed with him. Ultimately, a visiting scientist named Harsen reveals that the extreme heat is caused by an alien race of spiders are "beaming in" scouts from their home planet using a radio wave ray, which generates intense heat as a side effect.
The spiders themselves are carnivorous and eat humans, and give off bodily heat intense enough to burn alive any person who gets too close to them. Together with Harsen, Patricia, and science fiction author Vernon Stone, the Callums try to make it to the island's radio station to call for help so that they can thwart the invasion.
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