Elisha Barber by E. C. Ambrose (DAW, dist. by Penguin Group, 2013).
New Hampshire author E. C. Ambrose has just published the first book in what is planned as a series called Dark Apostle. I haven't read it yet, but I have been hearing about it from all sorts of people including a piece about it on Mary Robinette Kowal's blog and an interview with the author on All Things Considered.
Library Journal selected Elisha Barber as the July 2013 SF/Fantasy debut of the month: "Ambrose’s fantasy debut depicts a 14th-century England in which magic
and fledgling science exist side by side. Elisha’s struggle to bring
relief to those in need is complicated by his own need for redemption
and his innate fear of what he cannot understand. This beautifully told,
painfully elegant story should appeal to fans of L.E. Modesitt’s
realistic fantasies as well as of the period fantasy of Guy Gavriel Kay."