Whilst on a winter sports holiday in the Highlands, five children encounter an eccentric Professor, and find themselves involved in a web of industrial espionage.

Two salesmen travel to a small South American Country to peddle their wares. However the country is in the middle of a major conflict between the Government led by Diaz and the rebels led by Torez. When Torez is accidentally killed the rebels mistaken pick up one of the salesmen, Eric, as he looks like Torez. Eric and Ernie are promised millions to carry on the charade once the rebels take charge. However once Eric takes charge he finds himself back in danger as scheming general Carillo plans to remove the impostor from his role.