My Secret Sister
by Helen Edwards and Jenny Lee Smith
This one came recommended by Linda at Stitch Lines. I couldn't find it at the library, so I ordered a used copy from Amazon for 1¢ plus $3.99 shipping. It's a true story about twins separated shortly after birth; one suffered abuse and neglect, and one adopted into a loving and supportive family. When she decided to search for her birth family, she found a twin sister she never knew she had.
I finished my previous book (short critique here) this morning, so I will be starting My Secret Sister tonight.