While Matt and Mark are helping out a ranger who has broken down in a downpour near a swollen creek, Sonny and Clancy receive a visitor who matches a radio news report's description of an escaped robber.
Sonny is trying to study for school exam when Skippy takes him to a baby wombat whose mother has disappeared. He takes it back to ranger headquarters where chaos ensues when Mark tries to take him to quarantine.
There has been a bank robbery and the two robbers have hidden the money in a treasure chest in Matt's car. The chest should contain the prize for a treasure hunt being organised for children in Waratah National Park by the rangers.