The mountain has started singing.

Three nights before anyone disappears, Celeste Emberfall hears the pines on the northern ridge answer one another in notes too old to be wind. From Fire Tower Seven, she watches mist rise over Raven's Peak, finds a white raven feather, and uncovers a warning hidden in her family's old lookout records:

Do not follow the sound.

Then a survey crew vanishes while documenting forgotten fire tower sites, and their last transmission comes from a tower that does not appear on any current map.

Tower 13 should not exist.

But the mountain remembers it.

With Nathan Wilder and Audrey Finch investigating beside her, Celeste follows the trail into the northern ridges, where old maps change, ravens watch from the trees, signal fires burn on impossible peaks, and a hidden lookout holds records that should not have survived. The deeper they go, the more Celeste's Emberfall inheritance begins to wake ? and the more the mountain seems to know her name.

Something ancient is calling from beneath Raven's Peak.

And if Celeste cannot understand the warning before the fire returns, the mountain may open a door that was never meant to be found.