The spirit ring

"In an alternate Renaissance Italy where the church regulates magic and licenses magicians, fiery Fiametta Beneforte wants to be more than her goldsmith-mage father's unpaid apprentice. But when the Duchy of Montefoglia is laid under military and magical siege, she unexpectedly must join with Thur Ochs, a young Swiss miner and foundryman, to tap their skills in both metalwork and necromancy to rescue her father's soul and combat an evil sorcerer."--Amazon.com.