Forgiven / Shelley Shepard Gray.

Enhanced descriptions from Syndetics:

Tragedy strikes­--a brother and sister find themselves facing a situation that will shape the rest of their lives.

When a fire destroys the Lundys' barn, Winnie is injured trying to get the animals to safety. Confined to a hospital for weeks, out of touch with her loved ones who live too far away to visit by buggy, she must depend on Englisher Samuel Miller to keep her company. Though his family is part of Winnie's tight-knit Amish community, Samuel left years earlier to pursue a university education. Through conversations, and Samuel's dedication to her recovery, a friendship forms. But despite their growing attraction, Winnie knows it can never develop into something more as long as Samuel chooses to remain in the outside world.

When Winnie returns home, she finds her brother, Jonathan, struggling with his own dilemma. Cigarette butts were discovered in the debris of the barn and Jonathan is determined to find out who is responsible for destroying his property and putting his family at risk. But in a community founded on grace and forgiveness, will his unwillingness to move on eat away at the trust that is the foundation of their lives?