Rod and his friend Mukwe grow up together in a rural African town. They enjoy an idyllic upbringing until Rod is falsely accused of attacking a policeman who tries to shoot Rod's dog, Monty. Rod is jailed but with Mukwe and Monty's help, Rod manages to escape and they flee down the Zambezi River on a wild canoe ride.
Rod and Mukwe have to assume new identities in order to restart their lives and complete their education in another part of the country. Mukwe's studies enable him to develop two silicon chips that he and Rod insert into their forearms in order to secretly communicate in code.
After graduation, the two friends find employment in a diamond mine in Botswana. They uncover a planned heist and assist Interpol to trap the criminals in Antwerp, Belgium, the hub of the world's diamond trade.
As a result, Rod and Mukwe are quickly recruited by Scotland Yard to go undercover to thwart a drug-smuggling operation between Britain and Australia. Initially posing as drug mules, they are soon on the run from an outlaw bikie gang determined to eliminate them despite cover from the Australian Federal Police.