This is a story of a time of war and a baby that was adopted and grew up in a small Italian village. He was raised Catholic but he when he gets leukemia and they have to find a bone marrow donor, he finds he's Jewish.
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The only match they can find is a Rabbi in Brooklyn, New York. His marrow helps Luca get well. But it raises a lot of questions, too. His father said he got the baby from a convent of sisters. That was not true. He rescued him when the firefight took place and his parents died.
A nurse takes a great liking to Luca and spends time with him. Eventually, she'll take him to meet his donor. As Luca grows, he asks more questions. The answers are not usually happy. He finds a cousin through Nina, the nurse. When he goes to see him, he doesn't like him.
As things from his past start lining up with what happened, he learns that many people helped keep him alive. And he grows fond of Nina.
This is a time of war, secrets buried everywhere, but the most amazing fact is the despite the odds against him, Luca stays alive and goes on with his life.