Ghost in the Maze - Ghost Exile, #2

Caina Amalas is a Ghost circlemaster, leader of the Emperor's spies in Istarinmul. Yet the people of Istarinmul know her as the Balarigar, the daring master thief who challenged the corrupt lords and cruel princes of the city. And now Grand Master Callatas, the most powerful sorcerer of Istarinmul, wants her dead, and without allies Caina will not survive. So when a legendary thief offers Caina a chance to rob Callatas himself, she has no choice but to join the venture.
But no one has ever escaped the dark perils of Callatas's Maze...