Melanie Dobson 
Black Cloister [EPUB ebook] 

On Elise Friedman’s eighth birthday, she lost her mother and any connection to her mysterious past. Raised by her loving stepfather, Elise has spent years trying to learn the truth about her mother, Catrina, and her birth family in Germany, but still knows very little. Now a young woman in college, Elise is traveling to her homeland of Germany to uncover her family’s past, but what she finds is much more harrowing than she ever suspected.