Juan, an International chess master, and Julia, a writer of detective and horror novels, are conventionally married. Without children and both over 45, their lives contain a dangerously disturbing element: routine. Juan travels to Venice to compete against a computer in a tournament which has generated enormous expectation. There, he meets Irina, a charming and lively young woman with a sharp sense of humour. An expert in computers and chess, she has worked intensively on creating the complicated programme against which Juan will compete. Meanwhile, Julia finds herself forced to live with an intruder into their apartment: Andrés, a young unemployed man, who has been involved in holding-up a bank. Julia finds herself troubled by the young man who arouses a strange cocktail of maternal feeling and physical attraction. In reality, both Juan and Julia exaggerate the extent of their respective adventures. Both delight in the break from of their daily routine, the eternal seduction of the extraordinary of the dark side of the moon.

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