There are mysterious disappearances of young girls in the Swiss Alps and the police have recovered a victim's head covered with maggots. When the young Jennifer Corvino (Jennifer Connelly) arrives to the Richard Wagner Boarding School for girls, she seems to have problems adjusting and she also has a problem with sleepwalking. One night when she has woken up from her sleepwalking, she is brought to Professor John McGregor's residence by his assistant. She finds out that Professor McGregor is an entomologist and she has an ability to communicate with insects. Together, these two skills seem to be very helpful in the search for the killer of young girls. Phenomena is a film that looses its audience due to its weak story, but might keep some folks attention with its gruesome and creepy effects.