I have never looked into my sister's eyes. I have never bathed alone. I have never stood in the grass at night and raised my arms to a beguiling moon. I've never used an aeroplane bathroom. Or worn a hat. Or been kissed like that... So many things I've never done, but oh, how I've been loved. And, if such things were to be, I'd live a thousand times as me, to be loved so exponentially'

In twenty-nine years, Rose Darlen has never spent a moment apart from her twin sister, Ruby. She has never gone for a solitary walk or had a private conversation. Yet, in all that time, she has never once looked into Ruby's eyes. Joined at the head, 'The Girls' (as they are known in their small town) attempt to lead a normal life, but can't help being extraordinary. Now almost thirty, Rose and Ruby are on the verge of becoming the oldest living craniopagus twins in history, but they are remarkable for a lot more than their unusual sisterly bond.