She was seduced by an invisible man. She was chased like a wild beast. Pray it doesn't happen to you!

It is on Ascension Day that Zoe, a brilliant computer analyst, visits the National Park in the center of Athens with her daughter, Katerina. That afternoon in the park, Zoe experiences an overwhelming array of instinctive compulsions and transforms into an ancient Maenad in ecstatic frenzy, even capable of murder. Instincts and animals get loose and panic takes over.