The Darkness - The Mystic Realms, #2

Mica had discovered who she really was. After being utterly alone for so long, she'd found Skylar and Argenta, two of the best friends anyone could ask for. Mica was strong, but not even she fully knew the true depth of her powers. All she knew was that a prophecy claimed that she, Skylar and Argenta were destined to save the world. Prophecy or not, everything she knew and loved was now being threatened.
Skylar was gone! Someone had taken her right from under them. Mica was devastated. Her world was shattering. If it was the last thing she did - she would find Skylar and fulfill their destiny. The world depended on it.