Under the cover of night, Cecilia escapes from the high-tech home of her boyfriend Adrian by sedating him with sleeping pills and disabling the surveillance and alarm systems. Now the girl lives with a friend, afraid to go outside and suffers from persecution mania when she learns that her former tormentor committed suicide. Adrian, the leader of the market of optical developments, left Cecilia a large inheritance, and, finally, the girl's life should get better. But soon she begins to feel anxious again, as if Adrian is sneaking up on her - after all, it is impossible to hide from a stalker you can't see.