Books I and II of The Quorum of Kaŝe duology by Charles Moffat. The Dragontree of Kaŝe Adaoma is working in her crystal ball and magical orb shop in the mystical hidden city of Kaŝe off the coast from Lagos, Nigeria when she receives a strange phone call from her twin sister Adaora. Her twin tells her that terrorists have escaped from Rura Penthe, the extra-dimensional prison for housing criminal wizards...