Georg Roed, aged fifteen, tells us that his father died eleven years ago when he was four. He had never expected to hear from his dad again, but now they are writing a book together, from the family home in Humleveien in present-day Oslo. Georg is writing now because his grandmother found a letter addressed to him in the lining of his old buggy. Georg's father had hidden it there as a 'letter to the future', which allows Georg to get to know him in a way he couldn't eleven years ago. The person who figures most in the letter is not actually Georg's father; it is the mysterious and beautiful Orange Girl, whose identity Georg tries to discover..