One afternoon, Laurent is about to sneak away from work to see Thérèse. But his boss tells him that he will be fired if he keeps taking time off.
This throws a huge wrench into Laurent and Thérèse's regularly planned meetings. Now that Laurent can no longer leave the office, the lovers become desperate to see each other.
After about a fortnight of no lovin', Thérèse sneaks off to see Laurent, under cover of a lie that she has to visit a customer.
Lots of sex.
Then, of course Laurent and Thérèse talk about how they wish Camille were dead.
After Thérèse leaves, Laurent's mind drifts to thoughts of murder. He cannot stand being separated from Thérèse, and like any idiot in a book or movie, he thinks killing Camille will solve all of his problems.
Laurent falls asleep chanting to himself, "I shall kill him, I shall kill him."