The Crown Tower

Hadrian Blackwater, a warrior with nothing to fight for is paired with Royce Melborn, a thieving assassin with nothing to lose. Together they must steal a treasure that no one can reach. The Crown Tower is the impregnable remains of the grandest fortress ever built and home to the realm's most prized possessions. But it isn't gold or jewels that the old wizard is after, and if he can keep them from killing each other they become a legendary team.
This is the first book in the new series, The Riyria Chronicles, from best-selling author Michael J. Sullivan. It takes place twelve years before the events of The Riyria Revelations and no prior knowledge of those books is required. You can read in either chronological order or order of publication, although the author suggests reading in publication order.