When Karla goes to her friend Susie’s birthday party one December evening, she is excited – and a little proud. Today she can introduce Susie and a few others to Julian, who has agreed to come along that evening. Finally. Karla and Julian have been a couple for three years, but their lives usually run separately: he does things alone with his people, she with hers. Karla doesn’t yet know that there is a reason for this.