Barnie is a lot like many men. He has a wife he adores, a mistres he’s mad about, and a lover he… well, perhaps he is a little different. He lives in France with Lucie, but works in London, which is where he met Margot ad Mark. When his birthday comes he is very spoil: his mistress gives him a ticket for a romantic 1st of May’s weekend on the Orient Express to Venise ! ! ! Barnie is thrown. He decides to protect his marriage and send the other tickets back to his secret lovers, along with a nice little letter saying he’s sorry. Wise move. Trouble is, he gets the envelopes mixed up. Margot gets the letter for Mark and Mark gets the letters for Margot ! The two scorned lovers storm over to Barnie’s office and meet each other, face to face. They decide to go to Calais together to pay Barnie a little courtesy call ! But when they get to his house they meet Barnie’s wife before they can have it out with him. So they decide to "have a bit of fun" and pretend they are a bona-fide couple…