From audible.com:
Michael J. Sullivan garnered critical raves and a massive readership for his Riyria Revelations series. The first book in his highly anticipated Riyria Chronicles series of prequels, The Crown Tower brings together warrior Hadrian Blackwater with thieving assassin Royce Melborn. The two form a less-than-friendly pairing, but the quest before them has a rare prize indeed, and if they can breach the supposedly impregnable walls of the Crown Tower, their names will be legend.