Pierre Lachenay is a well-known publisher and lecturer, married with Franca and father of Sabine, around 10. He meets an air hostess, Nicole. They start a love affair, which Pierre is hiding, but he cannot stand staying away from her.
A Turkish ambassador arrives in Paris to sign an important trade agreement, allowing Turkey to buy a sophisticated new war plane from France. Immediately he is the target of an assassin, and a special agent is assigned to protect him.