The Hollow Crown Chronicles

Nobody in Greymere-on-Wold paid much attention to Mira Ashveil - the twelve-year-old girl who counted cracks in the ceiling and whispered to the gaps between the floorboards. Until one morning a new crack formed in the exact shape of a key. A letter with no postmark arrives, inviting her to Veilstone Academy for the Extraordinary Arts - a school where cracks are a language, walls remember, and the Veil between the ordinary and the extraordinary can be felt.
Mira is sorted into Ashen House, the smallest and oldest of the four Houses. There she discovers the Living Map: a vast, shifting network of cracks that has been growing for centuries and holds secrets her mother tried to hide. Mira's mother disappeared twelve years ago, leaving behind a crooked house full of cracks and a battered notebook. Only now does Mira understand the truth: the notebook is not just a record.
It is a map. And a key. Together with her new friends - a Resonator named Dessa and a Veil-Walker named Corvin - Mira must decipher a message sealed in the wall, find the Ashen Key, and decide whether to open the Third Gate. or seal it forever. Atmospheric dark academia fantasy about a girl who reads the language of cracks, a mother who left a dangerous legacy, and the price of knowledge. Book One of The Hollow Crown Chronicles.