A poor wretch dreams of becoming a traffic warden.

The most ultra-secret telephone number of all is that of the "Hot'Line' that links the heads of state of the United States and Moscow. A conniving double agent manages to steal the top secret phone number and then begins to implement chaos by phoning Washington and Moscow, telling the two powers that their respective spy chiefs are traitors. It's spy versus spy, agent versus double agent, counter spy against counter-counter spy in a rapidly increasing international crisis that finds its solution on the stage of Chinese theater in Barcelona, Spain as the spy leaders, the traitorous agent, a beautiful girl, three old ladies, a young man caught up in the chain of events and a troupe of acrobats collide head on in battle.

Barcelona, Spain. A young man is murdered in the middle of the street in front of the police headquarters. Miguel and Marcial, two agents of the Criminal Brigade in charge of the investigation, find in the victim's room a newspaper where a cryptic classified ad appears.

Lázaro and Sabino, employees of a large furniture store, fall in love with Laura, a new young and naive employee, who accepts their love. The trio lives a happy engagement. In the big store is planned a sensational advertising campaign with the bed "Eternal happiness," to be launched on New Year's Day. Lázaro and Sabino have to give the last touches on New Year's Eve. When they leave, they enter the exhibition truck and lie down on the bed. When they wake up in the morning, they are surrounded by a crowd and a scandal is organized.