In 29 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 the small town) attempt to lead a normal life, but can't help being extraordinary. 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 age and their unusual sisterly bond.