The Guns of Ivrea: Valdur Book One by Clifford Beal
Acquel Galenus, former thief and now monk of no particular skill, indifferent scribe and even worse chorister, uncovers a terrible secret under the Great Temple at Livorna that could shiver the one faith to its core. A secret that could get him killed. A secret that could enable an older, more sinister form of worship to be reborn... Pirate princeling Nicolo Danamis, mercenary to the King and captain of the largest fleet in the island kingdom of Valdur, has made one deal too many, and enemies are now closing in to destroy him.