Adding a little spice to a waning marriage, Anne (Toni Collette, Little Miss Sunshine) and Bob (Harvey Keitel, Reservoir Dogs), are hosting a luxurious dinner when Anne realises there are 13 guests. Panic-stricken, she insists her loyal maid Maria (Rossy de Palma) disguise herself as a mysterious Spanish noblewoman to even out the numbers. But a little too much wine and some playful chat leads Maria to accidentally endear herself to a dandy British art broker (Michael Smiley). Their budding romance will have Anne chasing her maid around Paris and finally plotting to destroy this most unexpected and joyous love affair.