Emerald Green, by Kerskin Gier

To the conlcusion of the Ruby Red trilogy, Gwen will face the mysterious Count Saint-German, who she believes is up to something.  When no one believes her it is up to her to stop him.  But can she?

I liked this book because it was suspenseful.

Two other books I would recommend are:  Hush, Hush AND The Klaato Diskos