Two siblings haunted by a childhood tragedy learn that the source of their horror is a mysterious mirror with a dark history. Tim (Brenton Thwaites) and Kaylie (Karen Gillan) were merely teenagers when both of their parents were brutally butchered. Convicted of the killings and sentenced to protective custody, Tim serves his time while Kaylie drifts into a deep despair. Years later, a newly free Tim does his best to lay the past to rest. Meanwhile, Kaylie is certain that her brother was innocent all along, and that the antique mirror their parents used to own holds the answer to her darkest questions. Upon locating the long-lost looking glass, Kaylie's deepest fears are confirmed -- a menacing force inhabits that mirror, and it has plagued every owner who has come into possession of it. Now, as curious Kaylie reacquires the mirror, the nightmarish cycle of horror returns with a vengeance.