Lydia's Hope: The Lost Sisters of Pleasant Valley, Book One

Three Amish sisters, separated when very young, know nothing about one another—until a long-held secret is revealed.
 
With no memory of her birth parents, or the tragic accident that took their lives, Lydia Beachy has always been grateful for the aunt and uncle who took her in and raised her as their own. Now a married woman with two sons, Lydia finds her life turned upside down when she discovers that she has two younger sisters: Susanna, who was adopted by an Amish family in another community, and Chloe, who was raised by their grandmother among the Englisch.
 
Angry and confused, Lydia first seeks out Susanna but stops short of telling her the truth. To track down Chloe, she enlists the help of a neighbor who has spent some years in the Englisch world. Meanwhile, Lydia’s husband, Adam, is keeping a secret of his own. Lydia yearns to be united with the sisters she has never known, but will revealing herself to them tear their lives apart…or enrich them beyond all imagining?