Grace Livingston Hill 
Blue Ruin 

Lynette and Dana had loved each other since childhood. Scholarly, handsome Dana knew he could mold Lynette—who had never challenged his authority or commitment to what was right—into the perfect “preacher’s wife.”
Then a sophisticated beauty from New York comes to visit Dana’s family. Before long, Dana seems captivated—and grows more and more critical of Lynette. Confused and hurt, Lynette reluctantly leaves on a family trip to Europe, plagued by questions and doubts: Will Dana walk into temptation? Has Lynette left her beloved in the grip of another woman?
Then Lynette meets a gentle, handsome stranger who brings her unexpected understanding and friendship—and whose striking blue eyes seem to see into her very soul. Suddenly she finds herself faced with an even more important question… one that may change her life forever.