Lizzie'd written the letter to get Mark Johnson to stop bothering her. A girl dating a soldier was untouchable, after all. Only, she hadn't expected anyone to respond. But she was glad he did. Tommy'd read the letter and smiled. There wasn't much to smile about in the trenches, after all. Not until this mystery letter. He didn't know this girl, but he wanted to. Tommy, Lizzie, the war, and the letters that got them through it.