Film tells Allan Karlsson, a famous explosives expert, is retiring. There is a birthday party which is held to celebrate his 100 years old. But he is not interested in snacks, champagne, he quietly climbs out the window and disappears. He pulls a huge suitcase on the road without knowing that he is holding a money suitcase of drug smugglers. The memories of a glorious return with the making of explosives, the pride that he had dinner with President Harry S. Truman, met Prime Minister Winston Churchill … And so he goes until the drug smugglers chase up.