On August 9, 1945, an American B-29 dropped an atomic bomb on Nagasaki, Japan, killing tens of thousands of people in the blink of an eye, while fatally injuring and poisoning thousands more. Among the survivors was Takashi Nagai, a pioneer in radiology research and a convert to the Catholic Faith. Living in the rubble of the ruined city and suffering from leukemia caused by over-exposure to radiation, Nagai lived out the remainder of his remarkable...