Quentaris - Quest of the Lost City: The Equen Queen

While moored to a new world Quentaris is approached by another sky-city. The traders on board seem friendly and generous, offering the Quentarans food and gems, but are they setting a trap for Quentaris?
What are the equens? Can they really heal the sick? Why can't Tab Vidler use her special powers any more? How do the screeching Loraskians so easily defeat Quentaris? And what is that trickster Fontagu hiding in the slaughterhouse?