When the London police chase a serial killer who drains his victims' blood, their search leads them to a plot involving an eccentric scientist and his experiments.

An amateur entomologist is left in Tokyo to study an unclassified species of beetle found in sandy locations. When he misses his bus back to civilization, he is persuaded to spend the night with a young widow in her hut at the bottom of a sand dune. What results is one of cinema's most unnerving and palpably erotic battles of the sexes, as well as a nightmarish depiction of the Sisyphean struggle of everyday life.