Beth Guyver never knew her father. For most of her life, the London resident believed he was a British pilot, killed during World War II. She thought he had died just before her birth in 1945.

The truth came out at a family Christmas dinner in 1990. Her mother looked across the table at one of Guyver's sons, then 18, and made a startling observation: He looked just like an American GI she had known in 1944 . . . just like Guyver's father.

The revelation changed Guyver's life.

For nearly two decades since then, she has been searching for her father, David Greene, a Pennsylvania man who was stationed at an Army Air Corps base in Chelveston, Northamptonshire, in the fall of 1944.