While mainland Britain shivers in deepest winter, the northern island of Fara bakes in the nineties during a strange November heat wave. The guys at the Met station have no more idea what is going on than the regulars at the Swan. Only a standoffish visiting scientist (Christopher Lee) suspects aliens are to blame. Meanwhile, the new secretary (Jane Merrow) to the local best selling author is raising the temperature in her own way. Also stars Patrick Allen and Peter Cushing as Dr. Vernon Stone.
This film was not released in the U.S. until 1971, where it played on a double bill with Godzilla's Revenge (1969).