When Elias Thorne returns to the crumbling family estate in the fog-drenched valley of Blackwood, he expects to bury his sister and settle her debts. Instead, he finds a house that breathes with secrets. His sister’s final journals speak of a “Shadow in the Glass”—an entity that has haunted the Thorne bloodline for generations. As the mirrors in the house begin to show things that shouldn’t exist, Elias must solve a century-old mystery before he becomes the next reflection to vanish into the dark.