Most of the reviews that I've found so far of the book "Identical Strangers" have been glowing. Sounds like an interesting read and fascinating real life story.
Here is one recent review:
Linked from http://booksandcooks.blogspot.com/2007_12_01_archive.html
Identical Strangers - A Memoir of Twins Separated and Reunited by Elyse Schein and Paula Bernstein was a terrific read. These twin sisters were adopted as infants and separated due to a secret study of identical twins being carried...Read Full Story
Paula Bernstein is co-author of the book "Identical Strangers" about her discovery that she had an identical twin sister. Paula's sister is Elyse Schein, the other co-author of the book.