Chilton visits Ireland to witness how rhododendrons, an ornamental plant that escaped a private garden, now threaten to choke out the last of the great oak forests of the United Kingdom. He escapes blood-thirsty midges and a murderous Hungarian architect while visiting a colony of forgotten Scottish wallabies; finds out how termites, brought in on packing crates after the Second World War, contributed to the devastation of Hurricane Katrina in New Orleans; and dodges crocodiles and big guns in the eucalyptus forests of Ethiopia.