Something evil is gaining power in the kingdom. It knows the deepest secrets, no one is safe...Young and headstrong Petra Kel received the rank of general of the queen's guard. But while Petra's mind is busy rebuilding the kingdom with her childhood friend Queen Belengaria, her heart remained far away on their home planet on the day she turned her back on the only person she ever loved and from whom she ran away. But then Petra's past - in the person of Zender, Bel's quarrelsome brother, bursts into her present, and at the same time rumors of dark magic begin to spread at court. Petra cannot afford to be distracted... But the unfinished story between her and Zender squeezes her heart in a vice. When evil takes over the kingdom and threatens Bel's life, Petra is forced to make an impossible choice between love and loyalty. Will the magic hidden in the Heart of the Stone reveal the heartbreaking reason why she left Zender all those years ago?