Caroline's Choice by Martha Rogers (Paperback / softback, 2011)

At age twenty-six, Caroline Frankston is certain life is passing her by in the town of Barton Creek. Matthew Haynes has made indication of his feelings for her, so she decides the time has come for her to move away from her family and friends for a fresh start. Once in Oklahoma City, Caroline is fascinated by the many opportunities there and begins moving on with her life. Meanwhile, Matt realizes his true feelings for Caroline and plans to tell her on her next trip home. When Caroline's train has an accident and she goes missing, Matt sets out in search of her, wondering if any chance of spending his life with Caroline has disappeared.