Amethyst

"Teenager Amy Winston lives a second life in the magical realm of Gemworld, where she is known as Princess Amethyst. . . When she tries to return to Gemworld to celebrate her 16th birthday in style, she discovers that the Amethyst Kingdom is missing! Her subjects have vanished, and no one in any of the neighboring lands--not even her best friend--remains loyal to her house. Left alone and dejected . . . , Amy must find new allies and confront dark secrets if she is to restore what's been taken"--.