Katrine learns that she needs a lung transplant before Christmas. Jimmy, Gabriel, and Cindy would like to give her parts of their sick lungs. But, for now, all they can do is distract her.

To keep up with his brother Benoit, Jimmy tries to convince his parents that he will introduce a new girlfriend at the gallery opening. Instead, it is Katrine who accompanies Jimmy to the opening, where she is bewildered to discover that her photo is featured among the works of art.

Jimmy supports Katrine, who is just about to have her lung transplant. However, Katrine's parents are beginning to get tired of the nonsense between friends.

After learning about what has happened to Katrine, Jimmy wants to leave work to be with her. However, his boss is fed up with the constant distractions. Katrine tells the others about her new plan, but they are not sure about the idea.

Katrine's friends and family have never been as worried about her as they are now. Jimmy remembers how his friendship with her began. When Katrine's fate is finally sealed, the foursome is thrust onto a new path which none of them had expected.

The group is unable to tie up all loose ends before Katrine's funeral. It is only once the ceremony is underway that their mysterious accomplice leads them to the last piece of the puzzle. Following this, the friends can now focus on their future.