The Gorgon's Gaze - Julia Golding

Connie Lionheart's calculating great-aunt and uncle try to take her away from the tantalizing reach of the Society for the Protection of Mythical Creatures. What they don't realize (or do they?) is that Connie is the Society's most important member--she is the only universal companion able to bond with all mythical creatures. Connie's great gift also puts her in great danger, as the evil shape-shifter Kullervo needs her power to destroy the Society once and for all. But how can Connie help anyone, even herself, when she hasn't learned how to use her gift yet? In this second book of the Companions Quartet, Connie and her friends team together again to protect the fragile bonds between humans, creatures, and the world we must share.