Cecilia escapes an abusive relationship with Adrian, a wealthy scientist specializing in optics. He seemingly takes his own life, leaving Cecilia a hefty inheritance. However, strange occurrences plague Cecilia, leading her to believe Adrian is alive and using his invisibility to torment her. As she tries to convince others of the danger, she’s dismissed as delusional. Cecilia must fight back against a foe no one can see, proving her sanity and surviving Adrian’s invisible attacks.