This is an older book, a nonfiction published in 2002, but it was new to me when I won it (okay, I stole it) at a white elephant gift exchange at Christmas.
As Always, Jack is really a sweet book. A woman (Emma Sweeney) finds a packet of letters her mother leaves to her. The letters are from her father, a man she never met. He had been a pilot during World War II, wooed and won her mother, and provided her with some brothers. A decade later, suddenly he no longer was around. You see, his plane went down at sea a few months before Emma was born.
In talking to her mother before her death and then in reading the letters, she begins to know her father--finally!--when she's an adult.