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 their small town) attempt to lead a normal life, but can't help being extraordinary.

Meet Rose and Ruby: sisters, best friends, confidantes, and conjoined twins. Since their birth, Rose and Ruby Darlen have been known simply as "the girls". They make friends, fall in love, have jobs, love their parents, and follow their dreams. But the Darlens are special. Now nearing their 30th birthday, they are history's oldest craniopagus twins, joined at the head by a pot the size of a bread plate.

When a 70-year-old woman finds a five-year-old girl abandoned on her doorstep, she is thrust into a sorrowful past that can only be conquered with the help of the girl who opened her memory - the very girl she is trying to save. This first novel, according to author Jacquelyn Mitchard, is one of "exquisite power, honesty, and conviction...quite nearly without flaws."