Jessica Jackson has hit all the milestones for turning thirty – the career, the loving boyfriend and a cosy London flat they share with their cat. But a shocking diagnosis of breast cancer turns Jess’s world upside down, and her contented life implodes with it. In the midst of it all, she meets Annabel, an enigmatic twenty-seven year old with incurable cancer who understands much more about living than anyone Jess has ever met. And she’s determined to show Jess how to make every day count.