The Equen Queen is the second book in the highly successful series: Quentaris ─ Quest of the Lost City and is the sequel to The Spell of Undoing by Paul Collins. 

While moored to a new world Quentaris is approached by another sky-city. The sky-traders on board seem friendly and generous, offering the Quentarans food and gems, but are in fact setting a trap for Quentaris. What are the equens and can they really heal the sick? Despite losing her special powers Tab Vidler must find some answers fast, before all is lost.