Claire is a 15-year-old student and her mother is a single mum who works as an obstetrician. They rarely find themselves in the same room at the same time, so they leave each other notes on the refrigerator door. What they don't realise at first is they are literally running out of time. When the mother is diagnosed with breast cancer, the notes become more poignant, especially when they realise they are wasting time arguing about Claire's boyfriend and who hasn't cleaned the rabbit's cage. It is such a short book (took me less than half an hour to read), that you feel as if you never really had the chance to get to know the characters properly. But maybe that was entirely the message the author wanted to convey.