"The Missing" by Beverly Lewis

Book two in the Seasons of Grace series. "The Secret" was book one. I found that book a really good easy read. This second book didn't go as fast when I read it. I got more interesting towards the end. Then it leaves you hanging on the edge of your seat waiting for the third book.
Grace Byler longs to discover the truth about her missing mother. She takes up the slack of the work her mother did. A nice young Amish man is helping her dad out with the lambs and is looking after Grace's horse. What other interests does he have? Grace makes friends with a modern girl named Heather. Heather's father is building a house across the road from Grace's family. Heather is sick and seeking natural ways to heal her body of cancer. Heather was adopted and finds out that her real family is Amish. Could this be a connection to the secret Lettie Byler is hiding?