Something is glowing beneath Ashley Lake.

Eight-year-old Poppy has always been too much: too sensitive, too aware, too easily overwhelmed by things no one else seems to notice. Her little sister Rosie has never been afraid of anything in her life. When their family moves to a cabin on a Montana lake, neither girl expects to find a trail of silver light leading into the forest, or a fairy who has waited a hundred and fifty years for two red-haired sisters to arrive.

But the lake is dying. Six ancient Voices are fading. And the only way to save them is to find seven scattered heart-stones before the boundary between worlds closes forever.

Every night, their mother traces a spiral on each daughter's palm: I love you through the wood, through the water, to the rock below. And every night, the child whispers back: I love you where the warm things go.

To do it, Poppy will have to trust the one thing she has always been afraid of: herself.

Book One of The Thin Places, a thirteen-book fantasy series for readers 8 to 12 and the adults reading over their shoulders, in which two sisters travel the world's real natural wonders and learn that sensitivity is not the same as weakness.

Where the world grows thin, magic begins.