Frygea Forest. An ancient and mystical place where trolls lurk in the mossy spaces between tree trunks and changelings scamper about, causing mischief. A place that Kyra and her sisters Margot and Janna return to every year to spend the summer at their grandmas farm: roasting marshmallows, catching frogs and befriending tiny, grumpy root goblins. But this summer is different, and as teenage Margot drifts apart from her sisters, slamming doors and keeping secrets, Kyra starts to worry. When Margot is enticed into the woods by the mysterious figures in the mist, Kyra resolves to do everything in her power to save her sister from danger, even if that means facing the spooky forces within Frygea Forest with just her kid sister for help.