Aeronaut's Guide to Rapture -- Paperback / softback

Ursule in 1864 lives the life of a kitchen skivvy in Paris. Dexter in 1965 is an American GI in Vietnam. Dante in 2015 is a Catholic priest in Palermo, Sicily. For Ursule the Prussians are closing in. For Dexter it's the Vietcong. For Dante it is the mafia. How can they escape, how can misery be turned into rapture?