Cecilia Kass is in a relationship with a brilliant, rich scientist. Unable to tolerate her violent and tyrannical behaviour, she runs away one night and takes refuge with her sister, their childhood friend and her teenage daughter.
But when the man commits suicide, leaving Cecilia a large part of his immense fortune, she begins to wonder if he is really dead. While a series of disturbing coincidences threaten the lives of her loved ones, Cecilia is desperate to prove that she is being stalked by a man no one can see. Little by little, she feels her reason wavering…