This story is all about power. Connie has a lot of power as a universal. She can talk to any mythical creature, unlike most companions who can only communicate with one, or a certain niche, of creatures. This makes her envied, feared and coveted. She has fought Kullervo and won before, he still wants the control of her powers so he can subdugate humanity and allow mythical creatures the ascendance.
Connie's power is going out of control, or is is, this story is the unravelling of why and how. Connie has to face up to the other members of the Society for the Protection of Mythical Creatures, and their fears as well as her own.
Secret of the Sirens (Companions Quartet) (Companions Quartet)was great, The Gorgon's Gaze (The Companions Quartet, Book Two) (Companions Quartet) faltered a bit but this made me want to find The Chimera's Curse (Companions Quest) and finish the series. I thought it was an interesting look at responsibility and standing up for yourself.