Birthdays are a Serious Business is a children's story, likely humorous, centered on a child who takes their birthday celebration, or perhaps the planning of someone else's, far too seriously. The plot would follow the protagonist's obsessive, detailed attempts to ensure the day is absolutely perfect, which inevitably leads to comical disaster and stress. The book gently pokes fun at the high expectations surrounding birthdays, ultimately showing that the joy of the day lies in friendship and fun, rather than meticulous organization or perfection.