From MinnPost:
For five years, writer Tom Bissell worked on a novel about the Apostle John, before he resigned himself to the fact that his “half historical, half contemporary” account was not going to work.
He set it aside, but one fact stuck in his mind: John’s tomb was located in Turkey and was supposedly empty — the only remains of the Twelve Apostles unaccounted for. Later while he was serving in the Peace Corps in Uzbekistan he heard rumors that Matthew’s remains were in nearby Kyrgyzstan. Where were the others?
From this question grew the idea for a travel book on the Apostolic tombs, and for the next few years Bissell traveled through Jerusalem, Greece, Italy, Turkey, France, Spain India, Turkey and Kyrgyzstan as a sort of doubting pilgrim who wanted to “explore the legendary encrustation upon twelve lives about which little else is known and even less can be historically verified.”