The story of a married American couple who go to the San Sebastian Film Festival. They get caught up in the magic of the festival, the beauty and charm of Spain and the fantasy of movies. She has an affair with a brilliant French movie director, and he falls in love with a beautiful Spanish woman who lives there.

Adding a little spice to a waning marriage, Anne and Bob, a wealthy and well-connected American couple, move into a manor house in romantic Paris. While preparing a particularly luxurious dinner for sophisticated international friends, our hostess discovers there are 13 guests. Panic-stricken, Anne insists her loyal maid Maria disguise herself as a mysterious Spanish noble woman to even out the numbers. But a little too much wine and some playful chat lead Maria to accidentally endear herself to a dandy British art broker. Their budding romance will have Anne chasing her maid around Paris and finally plotting to destroy this most unexpected and joyous love affair.