Corambis — Sarah Monette

Exiled from Melusine for the crime of heresy, the once powerful Cabaline wizard Felix Harrowgate and his half-brother Mildmay, former cat-burglar and assassin, journey to Corambis to face judgment from a ruling body of wizards. Corambis, however, is a land plagued by civil strife. Kay Brightmore, the Margrave of Rothmarlin, is part of an insurrection to restore the monarchy in the southern half of the country. In desperation, Kay and his rebels seek out the engine of Summerdown, an ancient magical device rumored to have terrible powers. Once the engine is awakened, only a powerful wizard can stop its awesome potential for destruction. Felix and Mildmay arrive just in time for their greatest challenge?and ultimate destiny?