Adrienne Vale

The library has always kept Raven's Peak's secrets. Now one of them has come back. When Ivy Blackthorne finds a raven waiting on the steps of the Blackthorne Library before dawn, she knows the morning will not be ordinary. Then the library unlocks itself, a white feather appears in the rain, and a woman missing for forty-two years collapses in the restricted archives carrying pages that should not exist.
Liora Vale vanished near Blackthorn Hollow in 1984. She says she was only gone three nights. The pages she brings back point toward a living map, a hidden clearing erased from every official record, and a dangerous force called the Hollow Heart. As Ivy follows the trail through old disappearance files, impossible geography, raven warnings, and the Blackthorne family's oldest secrets, she must face the truth that her library is not just a collection of records - it is part of Raven's Peak's magic.
Caleb Stone knows the mountain paths, the search patterns, and the dangers waiting beyond the tree line. But as he and Ivy track the mystery into the woods, the boundary between the town and the older territory begins to shift. Something beneath Raven's Peak is waking. And Ivy may be the only Blackthorne left who can read the warning before the mountain pays the price.