Night and Day, Dark and Light.

Kester is a Warden born. Kiana, a princess.
both meeting by chance when Kiana is being chased though an alleyway.
But both reunited later on when they join Kiana's older sister, Katherine and her friends to find a old friend and discover a dark secret about Glimmer Grove and an old fo of one of their ancestors.

And will that fo still be a threat?