Finder, The (Watcher's Quest Trilogy)

In the third book of The Watcher's Quest Trilogy, Emma stumbles into the world beyond the portal -- against the orders of Histal, Master of the Watcher's Campan. Here she finds a place of danger, intrigue and deadly Game Playing. Everything she values and everyone she loves is suddenly at stake. Emma's powers are constantly tested and threatened in this new world. Can she solve the ominous puzzles set up in the vast and treacherous maze? It won't be easy. But when Emma feels her weakest, she discovers an inner strength she did not realize she had ?