Theo is in a loveless marriage with her businessman husband Richard. At a party at home he encourages her to chat up and be especially nice to a new guest, Vincent. Theo leads a relatively quiet life while her husband leads a far more active social life. She and Vincent soon fall in love and run off together. Waiting on Dover to cross the Channel she reads a news report that her husband's investment company has collapsed. Theo was raised to be loyal above all and despite her professed love for Vincent she returns to her husband. Richard has no scruples however and he asks her to retrieve an incriminating document from Vincent using whatever means necessary.
—garykmcd