Young Penny goes on a retreat with her psychologist; the intention is to help her overcome her phobia, an intense fear of cars. Unexpected events find her in a nightmarish situation where her worst fears come true.
Detectives Nick O'Malley and Kate Benson work in Special Unit 2, a secret precinct of the Chicago Police Department whose sole charge is to protect the city's citizens from Links, a malicious paranormal species that is the missing link between man and beast.
