Envy: A Horror Novella. The Cardinal Sins, #4

The mirrors only show what you want to see-until they show you something else. When struggling artist Vivian Hale inherits an old Victorian mansion from her late Aunt Clara, she sees it as an opportunity to reinvent herself. But the house holds a secret: its walls are lined with antique mirrors, their glass too smooth, too deep, too alive. At first, the reflections inspire her. They show her a better version of herself-poised, confident, perfect.
The woman she could be. Then the mirrors start to change. They move when she doesn't. They whisper when no one else is around. And then, one day, her reflection smiles at her before she does. As Vivian becomes increasingly obsessed with her own reflection, she withdraws from friends, loses herself in her work, and begins to question what's real. The mirrors are no longer just showing her perfection.
They are offering it to her-at a price. And the deeper she stares into the glass, the less of herself she recognizes. Now, she's not sure if she's looking into the mirrors or if something inside them is looking out. For fans of Shirley Jackson, Stephen King, and Jennifer McMahon, Envy is a psychological horror tale of beauty, obsession, and the terrifying realization that once the mirrors have you in their grip, they never let go.
Envy is the fourth book in The Cardinal Sins series.