Relax Freddy(1966)

A Chinese diplomat is kidnapped from a conference in Genève and the world peace is at risk. The trail leads to a hiding place in Denmark and the Danish secret service brings in their best agent, agent Smith, who has been in a psychiatric hospital since his last assignment. To accompany Smith they once again turn to novelty and party tricks salesman Frede Hansen, because they need an unrecognizable man to infiltrate the crime syndicate behind the kidnapping.