James is stuck in the present and that's the last place he wants to be. His parents have suddenly separated, and he has to get used to living two completely different lives.
Now, he has two homes to stay in, two bedrooms to divide his things between, and two different routes to take to school. Unfortunately, nothing is adding up to the one great life James used to have and he wishes he could go back to the past, to his Top Six good memories with Mum and Dad. Then during Science Week, James meets the enigmatic Yan, a girl who looks at the world with x-ray eyes, and he discovers that travelling back in time might not be impossible after all. But are his best memories as perfect as he remembers?