Julia is infuriated by her grumpy neighbour, Cain, who can't even be pleasant when they bump into each other. She starts a blog in order to clinch her perfect job, and now she has a subject. Over the next 12 days, she is going to kill Cain with kindness - and Christmas cheer - and document it for all to read about. But as the experiment goes on, Julia realises she underestimated the effect it would have on Cain and on their relationship. and things take an unexpected turn.