Emily Young, a senior, wants to be elected as her sorority's president. She adopts a cute sloth, thinking it can become the new mascot and help her win, until a string of fatalities implicate the sloth as the main suspect in the murders.
A police-escorted prisoner transport supervised by Interpol sets off to Belgrade. The route leads the transport through Pančevo, where they encounter an ecological disaster and infected people who are trying to kill them. Interpol agents Mortimer Reyes and Mina Milius soon realize that their only chance for escape from the zombie hordes lies in allying with the dangerous, mysterious prisoner.
